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Question (1)

QN0030153

Which of the following best defines an isosceles triangle?

(A) A triangle with all sides equal
(B) A triangle with exactly one right angle
(C) A triangle with two equal sides
(D) A triangle with no equal sides

Correct Answer: C

Explanation:

An isosceles triangle has two equal sides.

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Question (2)

QN0030154

In an isosceles triangle, the angles opposite the equal sides are called:

(A) Exterior angles
(B) Base angles
(C) Reflex angles
(D) Vertical angles

Correct Answer: B

Explanation:

The angles opposite the equal sides are the base angles.

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Question (3)

QN0030155

Which statement is true for every equilateral triangle?

(A) It has exactly two equal sides.
(B) It has three equal sides and three equal angles.
(C) It has one right angle.
(D) It has two equal angles only.

Correct Answer: B

Explanation:

All sides and all angles are equal in an equilateral triangle.

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Question (4)

QN0030156

In an isosceles triangle, one base angle measures 68°. The other base angle is:

(A) 56°
(B) 68°
(C) 44°
(D) 112°

Correct Answer: B

Explanation:

Base angles of an isosceles triangle are equal.

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Question (5)

QN0030157

In an isosceles triangle, each base angle is 50°. What is the vertex angle?

(A) 50°
(B) 60°
(C) 70°
(D) 80°

Correct Answer: D

Explanation:

Vertex angle = 180° − 50° − 50° = 80°.

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Question (6)

QN0030158

Each angle of an equilateral triangle measures:

(A) 30°
(B) 45°
(C) 60°
(D) 90°

Correct Answer: C

Explanation:

The three equal angles together sum to 180°.

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Question (7)

QN0030159

In an isosceles triangle, the vertex angle is 40°. Each base angle is:

(A) 40°
(B) 50°
(C) 60°
(D) 70°

Correct Answer: D

Explanation:

(180° − 40°) ÷ 2 = 70°.

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Question (8)

QN0030160

If two angles of a triangle are equal, then the triangle is:

(A) Scalene
(B) Right-angled
(C) Isosceles
(D) Equilateral

Correct Answer: C

Explanation:

Equal angles imply the opposite sides are equal.

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Question (9)

QN0030161

An equilateral triangle has one angle equal to:

(A) 45°
(B) 50°
(C) 60°
(D) 75°

Correct Answer: C

Explanation:

Each angle of an equilateral triangle measures 60°.

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Question (10)

QN0030162

In an isosceles triangle, the vertex angle is 96°. Each base angle is:

(A) 42°
(B) 48°
(C) 52°
(D) 84°

Correct Answer: A

Explanation:

(180° − 96°) ÷ 2 = 42°.

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Question (1)

Which of the following best defines an isosceles triangle?

Explanation:

Link:

Question (2)

In an isosceles triangle, the angles opposite the equal sides are called:

Explanation:

Link:

Question (3)

Which statement is true for every equilateral triangle?

Explanation:

Link:

Question (4)

In an isosceles triangle, one base angle measures 68°. The other base angle is:

Explanation:

Link:

Question (5)

In an isosceles triangle, each base angle is 50°. What is the vertex angle?

Explanation:

Link:

Question (6)

Each angle of an equilateral triangle measures:

Explanation:

Link:

Question (7)

In an isosceles triangle, the vertex angle is 40°. Each base angle is:

Explanation:

Link:

Question (8)

If two angles of a triangle are equal, then the triangle is:

Explanation:

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Question (9)

An equilateral triangle has one angle equal to:

Explanation:

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Question (10)

In an isosceles triangle, the vertex angle is 96°. Each base angle is:

Explanation:

Link:

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