7
Answer: ASet 4: Triangles
Explanation
In a triangular roof design, two of the angles measure 39° and 84°. What is the measure of the third angle?
A.✓ Correct
57
B.
67
C.
47
D.
28
Detailed Explanation
Choice A is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 39° + 84° = 123° Third angle: 180° - 123° = 57° Therefore, the third angle is 57°.
Key Steps:
•
The correct answer is 57
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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