5
Answer: ASet 4: Triangles
Explanation
In a triangular roof design, two of the angles measure 64° and 65°. What is the measure of the third angle?
A.✓ Correct
51
B.
25
C.
61
D.
41
Detailed Explanation
Choice A is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 64° + 65° = 129° Third angle: 180° - 129° = 51° Therefore, the third angle is 51°.
Key Steps:
•
The correct answer is 51
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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