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Question (31)

QN0016297

Which set of angles represents an obtuse-angled triangle?

(A) 70°, 60°, 50°
(B) 80°, 50°, 50°
(C) 100°, 40°, 40°
(D) 45°, 45°, 90°

Correct Answer: C

Explanation:

One angle is greater than 90°.

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Question (32)

QN0016298

A triangle has sides 20 cm, 21 cm and 22 cm. It is:

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

Correct Answer: C

Explanation:

All sides are unequal.

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Question (33)

QN0016299

Which of the following triangles can also be isosceles?

(A) Right-angled triangle
(B) Scalene triangle
(C) Equilateral triangle
(D) Obtuse-angled triangle only

Correct Answer: A

Explanation:

A right-angled triangle can be isosceles (45°, 45°, 90°).

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Question (34)

QN0016300

A triangle has angles 75°, 75° and 30°. Based on sides, it is:

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

Correct Answer: B

Explanation:

Equal angles imply equal opposite sides.

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Question (35)

QN0016301

A triangular warning sign has angles 60°, 60° and 60°. The sign is shaped like a/an:

(A) Scalene triangle
(B) Isosceles triangle
(C) Equilateral triangle
(D) Right triangle

Correct Answer: C

Explanation:

All angles and sides are equal.

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Question (36)

QN0016302

Which of the following is not classified by side lengths?

(A) Equilateral triangle
(B) Isosceles triangle
(C) Scalene triangle
(D) Acute-angled triangle

Correct Answer: D

Explanation:

Acute-angled triangles are classified by angles.

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Question (37)

QN0016303

A triangle has sides 9 cm, 12 cm and 15 cm. No two sides are equal. It is:

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

Correct Answer: C

Explanation:

All sides are unequal.

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Question (38)

QN0016304

Which triangle has exactly one angle greater than 90°?

(A) Acute-angled triangle
(B) Right-angled triangle
(C) Obtuse-angled triangle
(D) Equilateral triangle

Correct Answer: C

Explanation:

Definition of an obtuse-angled triangle.

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Question (39)

QN0016305

A triangle has angles 55°, 55° and 70°. Based on side lengths, it is:

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

Correct Answer: B

Explanation:

Two equal angles imply two equal sides.

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Question (40)

QN0016306

A triangle has angles 25°, 65° and 90°. It is classified as:

(A) Acute-angled
(B) Obtuse-angled
(C) Right-angled
(D) Equilateral

Correct Answer: C

Explanation:

One angle is exactly 90°.

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Question (31)

Which set of angles represents an obtuse-angled triangle?

Explanation:

Link:

Question (32)

A triangle has sides 20 cm, 21 cm and 22 cm. It is:

Explanation:

Link:

Question (33)

Which of the following triangles can also be isosceles?

Explanation:

Link:

Question (34)

A triangle has angles 75°, 75° and 30°. Based on sides, it is:

Explanation:

Link:

Question (35)

A triangular warning sign has angles 60°, 60° and 60°. The sign is shaped like a/an:

Explanation:

Link:

Question (36)

Which of the following is not classified by side lengths?

Explanation:

Link:

Question (37)

A triangle has sides 9 cm, 12 cm and 15 cm. No two sides are equal. It is:

Explanation:

Link:

Question (38)

Which triangle has exactly one angle greater than 90°?

Explanation:

Link:

Question (39)

A triangle has angles 55°, 55° and 70°. Based on side lengths, it is:

Explanation:

Link:

Question (40)

A triangle has angles 25°, 65° and 90°. It is classified as:

Explanation:

Link:

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