5
Answer: DSet 3: Triangles
Explanation
A warning sign has a triangular shape. If two of its angles are 43° and 51°, what is the third angle?
A.
96
B.
76
C.
43
D.✓ Correct
86
Detailed Explanation
Choice D is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 43° + 51° = 94° Third angle: 180° - 94° = 86° Therefore, the third angle is 86°.
Key Steps:
•
The correct answer is 86
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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