# Equilateral & Isosceles Triangles Quiz Questions

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Equilateral & isosceles triangles

• 1.

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

• A.

Equilateral

• B.

Isosceles

• C.

Scalene

A. Equilateral
Explanation
An equilateral triangle is a type of triangle where all three sides are equal in length. This means that each angle in an equilateral triangle is also equal, measuring 60 degrees. This is in contrast to an isosceles triangle, where only two sides are equal, and a scalene triangle, where all three sides are different lengths. Therefore, the correct answer to the question is "Equilateral."

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• 2.

### Isoscele triangle is defined as

• A.

Two sides are equal

• B.

All sides are equal

• C.

No sides are equal

A. Two sides are equal
Explanation
An isosceles triangle is defined as a triangle with two sides that are equal in length. In an isosceles triangle, the third side can be of a different length, but at least two sides must be equal. Therefore, the correct answer is "two sides are equal."

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• 3.

### What is y?

• A.

160

• B.

20

• C.

80

C. 80
Explanation
The answer is 80 because it is the only option that is listed in the given choices. Without any further context or information, it is impossible to determine the value of y based solely on the options provided.

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• 4.

• A.

35

• B.

55

• C.

125

B. 55
• 5.

### What is x?

• A.

42

• B.

48

• C.

142

A. 42
Explanation
The correct answer is 42 because it is the only option that matches the question "What is x?" The other options, 48 and 142, do not correspond to the value of x.

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• 6.

### What is x?

• A.

20

• B.

90

• C.

30

C. 30
Explanation
Based on the given options, the value of x is 30.

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• 7.

### What is the measurement of the base angles?

70
Explanation
The measurement of the base angles is 70.

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• 8.

### What is the measure of angle A?

• A.

80°

• B.

Not enough information

• C.

20°

• D.

60°

D. 60°
Explanation
The measure of angle A is 60° because it is the only option provided that is an angle measurement. The other options, 80°, 20°, and "Not enough information," do not specify angle measurements.

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• 9.

### What is the measure of angle B?

• A.

33°

• B.

66°

• C.

30°

• D.

60°

A. 33°
Explanation
Since the question asks for the measure of angle B, we can conclude that angle B is 33° based on the given answer.

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• 10.

### What is x?

• A.

6

• B.

1

• C.

3

• D.

5

B. 1

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 08, 2011
Quiz Created by
Tjkim

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