Equilateral & Isosceles Triangles Quiz

1. What do you call a triangle whose sides are all equal?

Equilateral

Isosceles

Scalene

An equilateral triangle is a triangle that has all three sides of equal length. This means that all angles in the triangle are also equal, measuring 60 degrees each. In contrast, an isosceles triangle has two sides of equal length, while a scalene triangle has no sides of equal length. Therefore, the correct answer is equilateral.

Explanation

An equilateral triangle is a triangle that has all three sides of equal length. This means that all angles in the triangle are also equal, measuring 60 degrees each. In contrast, an isosceles triangle has two sides of equal length, while a scalene triangle has no sides of equal length. Therefore, the correct answer is equilateral.

2. Isoscele triangle is defined as

Two sides are equal

All sides are equal

No sides are equal

An isosceles triangle is defined as having two sides that are equal in length. This means that out of the three sides of the triangle, two of them have the same length. This is the defining characteristic of an isosceles triangle.

Explanation

An isosceles triangle is defined as having two sides that are equal in length. This means that out of the three sides of the triangle, two of them have the same length. This is the defining characteristic of an isosceles triangle.

3. What is the measure of angle B?

33°

66°

30°

60°

The measure of angle B is 33° because it is the only option provided that is less than 90°.

Explanation

The measure of angle B is 33° because it is the only option provided that is less than 90°.

4. What is x?

42

48

142

5. What is y?

160

20

80

not-available-via-ai

Explanation

not-available-via-ai

6. What is x?

35

55

125

not-available-via-ai

Explanation

not-available-via-ai

7. What is x?

20

90

30

not-available-via-ai

Explanation

not-available-via-ai

Submit

9. What is x?

6

1

3

5

10. What is the measure of angle A?

80°

Not enough information

20°

60°

The measure of angle A is 60° because it is the only option provided that is a possible angle measurement. The other options, 80°, 20°, and "Not enough information," are not valid answers because they are not supported by any given information or context. Therefore, the only logical choice is 60°.

Explanation

The measure of angle A is 60° because it is the only option provided that is a possible angle measurement. The other options, 80°, 20°, and "Not enough information," are not valid answers because they are not supported by any given information or context. Therefore, the only logical choice is 60°.