# Equilateral & Isosceles Triangles Quiz

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| By Jenn Shannon
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Jenn Shannon
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Quizzes Created: 1 | Total Attempts: 445
Questions: 10 | Attempts: 445

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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 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.

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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 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.

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• 3.

• A.

160

• B.

20

• C.

80

C. 80
• 4.

• A.

35

• B.

55

• C.

125

B. 55
• 5.

• A.

42

• B.

48

• C.

142

A. 42
• 6.

• A.

20

• B.

90

• C.

30

C. 30
• 7.

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

70
Explanation
The measurement of the base angles in this question 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 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°.

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• 9.

### What is the measure of angle B?

• A.

33°

• B.

66°

• C.

30°

• D.

60°

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

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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 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Nov 20, 2017
Quiz Created by
Jenn Shannon

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