9
Answer: ASet 5: Triangles
Explanation
In a triangular roof design, two of the angles measure 36° and 81°. What is the measure of the third angle?
A.✓ Correct
63
B.
31
C.
53
D.
73
Detailed Explanation
Choice A is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 36° + 81° = 117° Third angle: 180° - 117° = 63° Therefore, the third angle is 63°.
Key Steps:
•
The correct answer is 63
Why others are wrong:
B: This would give an incorrect result. Choice B 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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