9
Answer: BSet 3: Triangles
Explanation
A warning sign has a triangular shape. If two of its angles are 64° and 42°, what is the third angle?
A.
64
B.✓ Correct
74
C.
37
D.
84
Detailed Explanation
Choice B is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 64° + 42° = 106° Third angle: 180° - 106° = 74° Therefore, the third angle is 74°.
Key Steps:
•
The correct answer is 74
Why others are wrong:
A: This would give an incorrect result. Choice A is incorrect and may result from a calculation error.
C: This would give an incorrect result. Choice C 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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