9
Answer: BSet 2: Triangles
Explanation
In a triangular roof design, two of the angles measure 60° and 45°. What is the measure of the third angle?
A.
65
B.✓ Correct
75
C.
37
D.
85
Detailed Explanation
Choice B is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 60° + 45° = 105° Third angle: 180° - 105° = 75° Therefore, the third angle is 75°.
Key Steps:
•
The correct answer is 75
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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