4
Answer: DSet 2: Triangles
Explanation
In a triangular roof design, two of the angles measure 72° and 40°. What is the measure of the third angle?
A.
58
B.
78
C.
34
D.✓ Correct
68
Detailed Explanation
Choice D is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 72° + 40° = 112° Third angle: 180° - 112° = 68° Therefore, the third angle is 68°.
Key Steps:
•
The correct answer is 68
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.
C: This would give an incorrect result. Choice C is incorrect and may result from a calculation error.
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