1
Answer: CSet 3: Triangles
Explanation
A warning sign has a triangular shape. If two of its angles are 51° and 42°, what is the third angle?
A.
43
B.
77
C.✓ Correct
87
D.
97
Detailed Explanation
Choice C is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 51° + 42° = 93° Third angle: 180° - 93° = 87° Therefore, the third angle is 87°.
Key Steps:
•
The correct answer is 87
Why others are wrong:
A: This would give an incorrect result. Choice A is incorrect and may result from a calculation error.
B: This would give an incorrect result. Choice B is incorrect and may result from a calculation error.
D: This would give an incorrect result. Choice D is incorrect and may result from a calculation error.
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