1.
What is equal to the root of the square of the opposite?
Correct Answer
A. Adjacent
Explanation
The question is asking for the term that is equal to the root of the square of the opposite. The term that satisfies this condition is the "Adjacent" side in a right triangle. According to the Pythagorean theorem, in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. Therefore, the root of the square of the opposite side is equal to the adjacent side.
2.
The side opposite the right angle is called...
Correct Answer
B. Hypotenuse
Explanation
The side opposite the right angle in a right triangle is called the hypotenuse. The hypotenuse is the longest side of the triangle and is always opposite the right angle. It is found by using the Pythagorean theorem, which states that the square of the hypotenuse is equal to the sum of the squares of the other two sides. In this case, the hypotenuse is the correct answer because it accurately describes the side opposite the right angle.
3.
The division of the opposite side of a right angle with the adjacent side gives...
Correct Answer
B. Tan
Explanation
The division of the opposite side of a right angle with the adjacent side gives the tangent (Tan) of the angle.
4.
Given that a right angle has opposite sides a and b equals 4cm and 3cm, calculate the length of the hypotenuse.
Correct Answer
B. 5cm
Explanation
In a right triangle, the hypotenuse is the longest side and is opposite the right angle. According to the Pythagorean theorem, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides. In this case, the square of the hypotenuse is equal to 4^2 + 3^2, which is 16 + 9 = 25. Taking the square root of 25 gives us the length of the hypotenuse, which is 5cm.
5.
Pythagoras theorem states that...
Correct Answer
C. √a2+b2=√c2
Explanation
The given answer, √a2+b2=√c2, is the correct statement of the Pythagoras theorem. According to the theorem, in a right-angled triangle, the square of the length of the hypotenuse (c) is equal to the sum of the squares of the other two sides (a and b). Thus, taking the square root of both sides of the equation gives us √a2+b2=√c2, which represents the Pythagoras theorem accurately.
6.
Sin 30° = ?
Correct Answer
A. 1/2
Explanation
The correct answer is 1/2. The sine of 30 degrees is equal to 1/2. In trigonometry, the sine function relates the ratio of the length of the side opposite an angle to the length of the hypotenuse in a right triangle. In a 30-60-90 triangle, the side opposite the 30-degree angle is half the length of the hypotenuse. Therefore, sin 30 degrees equals 1/2.
7.
If sin a=-1/2, solve for 0°.
Correct Answer
C. 210° and 330°
Explanation
The sine function is negative in the third and fourth quadrants. Since sin a = -1/2, we know that the reference angle is 30°. In the third quadrant, the angle is 180° + 30° = 210°. In the fourth quadrant, the angle is 360° - 30° = 330°. Therefore, the solutions are 210° and 330°.
8.
If tan b=5/4 find sin2b-cos2b.
Correct Answer
D. 9/41
Explanation
To find sin2b-cos2b, we need to use the trigonometric identities. We know that sin2b = 2sinb*cosb and cos2b = cos^2b - sin^2b. From the given information, we have tan b = 5/4. We can use this to find sinb and cosb. We know that tan b = sinb/cosb, so sinb = 5 and cosb = 4. Now we can substitute these values into the identities. sin2b = 2(5)(4) = 40 and cos2b = (4)^2 - (5)^2 = 16 - 25 = -9. Therefore, sin2b-cos2b = 40 - (-9) = 40 + 9 = 49. However, none of the answer choices match 49, so the correct answer is not given.
9.
A man 40m from the foot of a tower observes the angle of elevation of the tower to be 30°. Determine the height of the tower.
Correct Answer
A. 40√3/3
Explanation
The man is standing 40m away from the foot of the tower. He observes the angle of elevation of the tower to be 30°. To determine the height of the tower, we can use the tangent of the angle of elevation. The tangent of 30° is equal to the opposite side (height of the tower) divided by the adjacent side (distance from the man to the foot of the tower). Therefore, the height of the tower is 40√3/3.
10.
If sin c = 3/5, find tan c.
Correct Answer
B. 3/4
Explanation
If sin c = 3/5, we can use the Pythagorean identity sin^2 c + cos^2 c = 1 to find cos c. Since sin c = 3/5, we can square it to get (3/5)^2 = 9/25. Subtracting this from 1 gives us 1 - 9/25 = 16/25. Taking the square root of this gives us cos c = 4/5. To find tan c, we can divide sin c by cos c, giving us (3/5)/(4/5) = 3/4. Therefore, the correct answer is 3/4.