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Question (21)

QN0016287

Which set of sides forms an isosceles triangle?

(A) 9 cm, 10 cm, 11 cm
(B) 8 cm, 8 cm, 12 cm
(C) 5 cm, 6 cm, 7 cm
(D) 3 cm, 4 cm, 5 cm

Correct Answer: B

Explanation:

Two sides are equal.

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Question (22)

QN0016288

A triangle has one angle measuring exactly 90°. Which type is it?

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

Correct Answer: C

Explanation:

A right-angled triangle contains a 90° angle.

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Question (23)

QN0016289

A triangle with angles 89°, 45° and 46° is:

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

Correct Answer: A

Explanation:

All angles are less than 90°.

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Question (24)

QN0016290

A triangle has sides 15 cm, 15 cm and 15 cm. It is:

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

Correct Answer: C

Explanation:

All three sides are equal.

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Question (25)

QN0016291

Which of the following triangles is classified by angles?

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

Correct Answer: D

Explanation:

Obtuse-angled triangles are classified by angles.

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Question (26)

QN0016292

A triangle has angles 95°, 45° and 40°. It is:

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

Correct Answer: C

Explanation:

One angle is greater than 90°.

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Question (27)

QN0016293

Which type of triangle can have all three sides unequal?

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

Correct Answer: C

Explanation:

A scalene triangle has all sides unequal.

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Question (28)

QN0016294

A triangle has sides 11 cm, 11 cm and 18 cm. It is:

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

Correct Answer: B

Explanation:

Two sides are equal.

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Question (29)

QN0016295

Which triangle is classified using side lengths only?

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

Correct Answer: D

Explanation:

Scalene triangles are classified by side lengths.

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Question (30)

QN0016296

A triangle has angles 30°, 60° and 90°. It is:

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

Correct Answer: B

Explanation:

One angle is 90°.

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Question (21)

Which set of sides forms an isosceles triangle?

Explanation:

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Question (22)

A triangle has one angle measuring exactly 90°. Which type is it?

Explanation:

Link:

Question (23)

A triangle with angles 89°, 45° and 46° is:

Explanation:

Link:

Question (24)

A triangle has sides 15 cm, 15 cm and 15 cm. It is:

Explanation:

Link:

Question (25)

Which of the following triangles is classified by angles?

Explanation:

Link:

Question (26)

A triangle has angles 95°, 45° and 40°. It is:

Explanation:

Link:

Question (27)

Which type of triangle can have all three sides unequal?

Explanation:

Link:

Question (28)

A triangle has sides 11 cm, 11 cm and 18 cm. It is:

Explanation:

Link:

Question (29)

Which triangle is classified using side lengths only?

Explanation:

Link:

Question (30)

A triangle has angles 30°, 60° and 90°. It is:

Explanation:

Link:

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