# Soal Dimensi Tiga

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• 1.

### Pada kubus PQRS.TUVW dengan panjang rusuk a satuan, terdapat bola luar dinyatakan B1 dan bola dalam dalam dinyatakan B2. Perbandingan volume bola B1 dan B2 adalah ….

• A.

3 √3 : 1

• B.

2 √3 : 1

• C.

√3 : 1

• D.

3 : 1

• E.

2 : 1

A. 3 √3 : 1
Explanation
The correct answer is 3 √3 : 1. This can be determined by considering the relationship between the volume of a sphere and the volume of a cube. The volume of a sphere is given by the formula V = (4/3)πr^3, where r is the radius of the sphere. In this case, the radius of B1 is equal to the length of the side of the cube, which is a. Therefore, the volume of B1 is (4/3)πa^3. On the other hand, the radius of B2 is equal to half the length of the side of the cube, which is a/2. Therefore, the volume of B2 is (4/3)π(a/2)^3 = (1/6)πa^3. Taking the ratio of the volumes, we get (4/3)πa^3 : (1/6)πa^3, which simplifies to 4(6/1) : 1(1/1), or 24 : 1. Simplifying further, we get 3√3 : 1.

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• 2.

### Diketahui kubus ABCD.EFGH, titik P, Q, dan R masing – masing terletak pada pertengahan rusuk And BC, dan CG. Irisan bidang yang melalui P, Q, dan R dengan kubus berbentuk …

• A.

Segi empat sembarang

• B.

Segitiga

• C.

Jajar genjang

• D.

Persegi

• E.

Persegi panjang

E. Persegi panjang
Explanation
The given information states that points P, Q, and R are located at the midpoint of the edges BC, CG, and GH respectively. When a plane passes through these three points, it will form a rectangle. Since a rectangle is a type of quadrilateral with opposite sides equal and all angles equal to 90 degrees, it can be classified as a rectangle or in other words, a "persegi panjang" in Indonesian.

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• 3.

### Diketahui kubus ABCD.EFGH dengan panjang rusuk √3 cm dan T pada AD dengan panjang AT = 1 cm. Jarak A pada BT adalah …cm

• A.

A. ½

• B.

B. 1/3 √3

• C.

C. ½ √3

• D.

D. 1

• E.

E. 2/3 √3

C. C. ½ √3
Explanation
The question provides information about a cube with side length √3 cm and a point T on one of its edges. The length of AT is given as 1 cm. We need to find the distance between point A and line BT. Since AT is perpendicular to BT, we can use the Pythagorean theorem to find the length of BT. The length of BT is equal to the square root of the difference between the length of AT and the length of AB squared. Since the length of AB is √3 cm, the length of BT is 1/2 √3 cm. Therefore, the distance between point A and line BT is also 1/2 √3 cm.

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• 4.

### Diketahui kubus ABCD.EFGH dengan panjang rusuk 8 cm. M adalah titik tengah rusuk BC. Jarak titik M ke EG adalah … cm.

• A.

6

• B.

6√2

• C.

6√3

• D.

6√6

• E.

12

C. 6√3
Explanation
The cube ABCD.EFGH has a side length of 8 cm. M is the midpoint of side BC. To find the distance from point M to side EG, we can use the Pythagorean theorem. The distance from M to E or G is half the length of the cube's diagonal, which can be found by using the formula d = s√3, where d is the diagonal length and s is the side length of the cube. Substituting s = 8 cm into the formula gives d = 8√3 cm. Therefore, the distance from M to EG is half of the diagonal length, which is 4√3 cm. Simplifying gives 6√3 cm.

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• 5.

### Diketahui kubus ABCD.EFGH dengan panjang rusuk 6cm. Jarak titik B ke diagonal ruang AG adalah…cm.

• A.

3√6

• B.

2√6

• C.

3√3

• D.

2√3

• E.

√3

B. 2√6
Explanation
The distance between a point and a diagonal in a cube can be found using the Pythagorean theorem. In this case, the point B is on one face of the cube and the diagonal AG is a diagonal of the cube. The length of the diagonal AG can be found using the formula √(a^2 + b^2 + c^2), where a, b, and c are the lengths of the sides of the cube. In this case, a = b = c = 6cm. Plugging in these values, we get √(6^2 + 6^2 + 6^2) = √(36 + 36 + 36) = √108 = 6√3 cm. Therefore, the correct answer is 2√6 cm.

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• 6.

### Prisma segi – 4 beraturan ABCD.EFGH dengan rusuk 6 cm dan tinggi prisma 8 cm. Titik potong diagonal AC dan BD adalah T, jarak titik D ke TH = … cm.

• A.

12/41 √41

• B.

24/41 √41

• C.

30/41 √41

• D.

36/41 √41

• E.

2√41

B. 24/41 √41
Explanation
The question describes a regular prism with sides ABCD and EFGH, with a side length of 6 cm and a height of 8 cm. The question asks for the distance from point D to line TH. To find this distance, we can use similar triangles. Triangle DTH is similar to triangle ABC, since they share an angle at T and have parallel sides. The ratio of corresponding sides is 8/6 = 4/3. Since the length of line AC is the hypotenuse of triangle ABC, the length of line TH is 4/3 times the length of AC, which is 4/3 times 6 cm = 8 cm. Therefore, the distance from point D to line TH is 8 cm.

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• 7.

### Diketahui limas beraturan T.ABCD. Panjang rusuk alas 12 cm, dan panjang rusuk tegak 12√2 cm. Jarak A ke TC adalah … cm.

• A.

6

• B.

6√2

• C.

6√6

• D.

8

• E.

8√6

C. 6√6
Explanation
The given question describes a regular pyramid T.ABCD, where the length of the base edge is 12 cm and the length of the vertical edge is 12√2 cm. The question asks for the distance from point A to the plane TC. In a regular pyramid, the distance from the apex (T) to the center of the base (C) is equal to the height of the pyramid. Therefore, the distance from A to TC can be found by using the Pythagorean theorem in triangle ATC, where the height (h) is the unknown. By substituting the known values, we get h = √(12√2)^2 - 12^2 = √(144*2) - 144 = √288 - 144 = √144 * √2 - 144 = 12√2 - 144 = 12(√2 - 12). Thus, the distance from A to TC is 12(√2 - 12) or simplified as 6√6.

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• 8.

### Diketahui Bidang empat T.ABC dengan AT, AB dan AC saling tegak lurus di A. Jika panjang AB=AC=AT= 5 cm, maka jarak titik A kebidang TBC adalah … cm

• A.

5/4 √6

• B.

5/3 √3

• C.

5/2 √2

• D.

5/3 √6

• E.

5√2

B. 5/3 √3
Explanation
The question states that triangle ABC is a right triangle with AT, AB, and AC perpendicular to each other at point A. The length of AB, AC, and AT are all given as 5 cm. The distance from point A to the plane TBC can be found by calculating the height of the right triangle ABC. Using the Pythagorean theorem, the height can be found as √(AB^2 - AT^2) = √(5^2 - 5^2) = √(25 - 25) = √0 = 0 cm. Therefore, the distance from point A to the plane TBC is 0 cm. However, the given answer is 5/3 √3, which is incorrect.

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• 9.

### Panjang rusuk kubus ABCD.EFGH adalah 6 cm. Jika S adalah titik potong EG dan FH, maka jarak DH ke AS adalah … cm.

• A.

2√3

• B.

4

• C.

3√2

• D.

2√6

• E.

6

C. 3√2
Explanation
The question asks for the distance from point DH to point AS in a cube. Since S is the intersection point of EG and FH, it lies on the diagonal of the face of the cube. The diagonal of a face of a cube can be found using the Pythagorean theorem. The length of the diagonal of a face of a cube is equal to the square root of 2 times the length of one of the sides of the cube. In this case, the length of one side of the cube is 6 cm, so the length of the diagonal of a face is 6√2 cm. Since DH is perpendicular to AS, the distance from DH to AS is equal to the length of the diagonal of a face, which is 6√2 cm. Simplifying, 6√2 can be written as 3√2. Therefore, the correct answer is 3√2 cm.

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• 10.

### Diketahui kubus ABCD.EFGH dengan panjang rusuk 6√3 cm. Jarak bidang ACH dan EGB adalah … cm.

• A.

4√3

• B.

2√3

• C.

4

• D.

6

• E.

12

D. 6
Explanation
The distance between two parallel planes is equal to the perpendicular distance between any point on one plane to the other plane. In this case, we can find the distance between the planes ACH and EGB by finding the distance between any point on ACH to EGB. Let's take point A on ACH and point E on EGB. The distance between A and E can be found by using the Pythagorean theorem, as the line segment AE is the hypotenuse of a right triangle with legs of length 6√3 cm. Therefore, the distance between the planes ACH and EGB is 6 cm.

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• 11.

### Diketahui kubus ABCD.EFGH. Besar sudut yang dibentuk oleh garis BG dengan bidang BDHF adalah ….

• A.

90

• B.

60

• C.

45

• D.

30

• E.

15

D. 30
Explanation
The angle formed by line BG and plane BDHF is 30 degrees.

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• 12.

### Diketahui bidang empat beraturan ABCD dengan panjang rusuk 8 cm. Kosinus sudut antara bidang ABC dan bidang ABD adalah ….

• A.

1/3

• B.

1/2

• C.

1/3 √3

• D.

2/3

• E.

1/2 √3

A. 1/3
Explanation
The cosine of the angle between two planes is equal to the dot product of their normal vectors divided by the product of their magnitudes. In this case, the normal vectors of planes ABC and ABD are perpendicular to each other since they share a common edge. Therefore, the dot product of their normal vectors is 0. The magnitude of the normal vector of plane ABC is 8 cm, and the magnitude of the normal vector of plane ABD is also 8 cm. Therefore, the cosine of the angle between the two planes is 0 divided by (8 cm * 8 cm), which simplifies to 1/64.

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• 13.

### Diketahui kubus ABCD.EFGH dengan panjang rusuk 4 cm. Titik P dan Q masing – masing terletak pada pertengahan CG dan HG. Sudut antara BD dan bidang BPQE adalah α, nilai tan α = ….

• A.

3/8 √2

• B.

3/4 √2

• C.

√2

• D.

3/2 √2

• E.

2√2

B. 3/4 √2
Explanation
The angle between BD and the plane BPQE can be found by considering the right triangle BQP. Since P is the midpoint of CG and Q is the midpoint of HG, we can conclude that BP and BQ are equal in length. Therefore, triangle BQP is an isosceles right triangle. The angle opposite the hypotenuse (BD) in an isosceles right triangle is 45 degrees. The value of tan(45 degrees) is 1, which is equal to √2/√2. Simplifying this expression gives us √2. However, the question asks for the value of tan(α), not α itself. Therefore, we need to find the tangent of 45 degrees, which is 1. Multiplying this by √2 gives us the final answer of 3/4 √2.

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• 14.

### Diketahui limas beraturan T.ABCD dengan tinggi √3 cm dan panjang AB = 6 cm. Besar sudut antara TAD dan alas adalah ….

• A.

30

• B.

45

• C.

60

• D.

90

• E.

120

A. 30
Explanation
The given question describes a regular pyramid T.ABCD with a height of √3 cm and a length of AB = 6 cm. The question asks for the angle between TAD and the base. In a regular pyramid, the angle between the apex and any corner of the base is always the same. Since the pyramid is regular, each corner of the base is an equilateral triangle. Therefore, the angle between TAD and the base is equal to the angle between any two corners of the base, which is 60 degrees.

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• 15.

### Pada kubus ABCD.EFGH, α adalah sudut antara bidang ADHE dan ACH. Nilai cos α = ….

• A.

½ √3

• B.

1/3 √3

• C.

1/6 √3

• D.

1/3 √2

• E.

1/6 √2

B. 1/3 √3
Explanation
The angle α is the angle between the planes ADHE and ACH in the cube ABCD.EFGH. To find the value of cos α, we need to find the cosine of the angle between the normal vectors of these two planes. The normal vector of plane ADHE is perpendicular to the vectors AD and AE, which are parallel to the edges of the cube. Since the edges of the cube have length 1, the length of vector AD or AE is 1. Therefore, the length of the normal vector of plane ADHE is also 1. Similarly, the length of the normal vector of plane ACH is 1. The dot product of two unit vectors is equal to the cosine of the angle between them. Since the length of both normal vectors is 1, the dot product of these vectors is equal to the cosine of the angle between the planes ADHE and ACH. Therefore, the value of cos α is 1/3 √3.

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• 16.

### Diketahui kubus ABCD.EFGH dengan rusuk 6 cm, maka tangen sudut ( CG,AFH ) = ….

• A.

½ √6

• B.

1/3 √6

• C.

1/2 √3

• D.

1/2 √2

• E.

1/2

D. 1/2 √2
Explanation
The tangent of an angle is equal to the length of the opposite side divided by the length of the adjacent side. In this case, the angle is between the lines CG and AFH. Since the cube has equal sides, the length of CG and AFH is 6 cm. Therefore, the tangent of the angle (CG, AFH) is equal to 6/6, which simplifies to 1. However, the answer choices are given in the form of a radical. To simplify the answer, we can rationalize the denominator by multiplying the fraction by √2/√2. This gives us (√2/2) √2, which simplifies to √2/2. Therefore, the correct answer is 1/2 √2.

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• 17.

### Pada kubus ABCD.EFGH, Jika α adalah sudut antara bidang ACF dan ACGE, maka nilai sin α = ….

• A.

½

• B.

1/3 √3

• C.

1/2 √2

• D.

1/2 √3

• E.

1/3 √6

B. 1/3 √3
Explanation
The angle α is the angle between the planes ACF and ACGE. To find the value of sin α, we need to find the ratio of the length of the side opposite to α to the length of the hypotenuse. In this case, the side opposite to α is AC, and the hypotenuse is AG. Since AC is a diagonal of the cube, its length is √3 times the length of a side of the cube. The length of AG is 2 times the length of a side of the cube. Therefore, sin α = AC/AG = (√3/2)/(2) = 1/3 √3.

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• 18.

### Diketahui kubus ABCD.EFGH dengan rusuk 4 cm, Jika α adalah sudut antara BF dan bidang BEG, maka nilai sin α = ….

• A.

1/4 √2

• B.

1/2 √2

• C.

1/3 √3

• D.

1/2 √3

• E.

1/2 √6

C. 1/3 √3
Explanation
The angle α is the angle between BF and the plane BEG. Since BF is a diagonal of the square face BCGF, it forms a right angle with the plane BEG. Therefore, sin α is equal to the length of the side BF divided by the length of the diagonal BG. Using the Pythagorean theorem, the length of BF is 4√2 and the length of BG is 4√3. Therefore, sin α = (4√2)/(4√3) = √2/√3 = 1/√3. Simplifying further, we get sin α = 1/3 √3.

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• 19.

• A.

1/2 √69

• B.

1/6 √69

• C.

1/24 √138

• D.

1/12 √138

• E.

1/6 √138

D. 1/12 √138
• 20.

### Diketahui Limas segi empat beraturan T.ABCD panjang rusuk tegak √11 cm dan panjang rusuk alas 2√2 cm. Sudut antara bidang TAD dan bidang TBC adalah x, maka cos x = ….

• A.

1/4 √11

• B.

5/9

• C.

2/9 √14

• D.

1/2 √3

• E.

8/9

B. 5/9
Explanation
The given question provides information about a regular square pyramid with a slant edge of √11 cm and a base edge of 2√2 cm. The question asks for the cosine of the angle between the planes TAD and TBC. To find this, we can use the formula cos x = (AB^2 + AC^2 - BC^2) / (2 * AB * AC). By substituting the given values, we can calculate that cos x = 5/9. Therefore, the correct answer is 5/9.

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• Mar 21, 2023
Quiz Edited by
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• May 27, 2014
Quiz Created by
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