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Question (21)

QN0016207

If one angle of a triangle is 85° and another is 65°, the third angle is:

(A) 20°
(B) 25°
(C) 30°
(D) 35°

Correct Answer: C

Explanation:

180° − (85° + 65°) = 30°.

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Question (22)

QN0016208

The angles of a triangle are in the ratio 3 : 5 : 7. The largest angle is:

(A) 60°
(B) 72°
(C) 84°
(D) 96°

Correct Answer: C

Explanation:

Angles are 36°, 60°, 84°.

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Question (23)

QN0016209

If two angles of a triangle are 42° and 58°, the third angle equals:

(A) 70°
(B) 75°
(C) 80°
(D) 90°

Correct Answer: C

Explanation:

180° − 100° = 80°.

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Question (24)

QN0016210

Which of the following is impossible for a triangle?

(A) 60°, 60°, 60°
(B) 45°, 45°, 90°
(C) 120°, 30°, 30°
(D) 100°, 50°, 50°

Correct Answer: D

Explanation:

Sum = 200°, not 180°.

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Question (25)

QN0016211

A triangle has angles x°, 2x°, and 3x°. Find x.

(A) 20°
(B) 25°
(C) 30°
(D) 35°

Correct Answer: C

Explanation:

x + 2x + 3x = 180°.

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Question (26)

QN0016212

If one angle is 95° and another is 25°, the third angle is:

(A) 50°
(B) 55°
(C) 60°
(D) 65°

Correct Answer: C

Explanation:

180° − 120° = 60°.

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Question (27)

QN0016213

The angles of a triangle are 2x°, 2x°, and x°. Find the largest angle.

(A) 60°
(B) 72°
(C) 75°
(D) 80°

Correct Answer: B

Explanation:

5x = 180°, x = 36°, largest angle = 72°.

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Question (28)

QN0016214

Which set satisfies the Angle Sum Property?

(A) 65°, 55°, 60°
(B) 75°, 65°, 50°
(C) 90°, 45°, 55°
(D) 110°, 30°, 50°

Correct Answer: A

Explanation:

65° + 55° + 60° = 180°.

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Question (29)

QN0016215

If two angles are 68° and 74°, the third angle is:

(A) 28°
(B) 38°
(C) 48°
(D) 58°

Correct Answer: B

Explanation:

180° − 142° = 38°.

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Question (30)

QN0016216

A triangle has one angle equal to half of 100° and another angle equal to 40°. The third angle is:

(A) 80°
(B) 85°
(C) 90°
(D) 95°

Correct Answer: C

Explanation:

50° + 40° = 90°, third angle = 90°.

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Question (21)

If one angle of a triangle is 85° and another is 65°, the third angle is:

Explanation:

Link:

Question (22)

The angles of a triangle are in the ratio 3 : 5 : 7. The largest angle is:

Explanation:

Link:

Question (23)

If two angles of a triangle are 42° and 58°, the third angle equals:

Explanation:

Link:

Question (24)

Which of the following is impossible for a triangle?

Explanation:

Link:

Question (25)

A triangle has angles x°, 2x°, and 3x°. Find x.

Explanation:

Link:

Question (26)

If one angle is 95° and another is 25°, the third angle is:

Explanation:

Link:

Question (27)

The angles of a triangle are 2x°, 2x°, and x°. Find the largest angle.

Explanation:

Link:

Question (28)

Which set satisfies the Angle Sum Property?

Explanation:

Link:

Question (29)

If two angles are 68° and 74°, the third angle is:

Explanation:

Link:

Question (30)

A triangle has one angle equal to half of 100° and another angle equal to 40°. The third angle is:

Explanation:

Link:

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