4
Answer: DSet 3: Triangles
Explanation
Abigail is creating a triangular art piece. Two corners have angles of 63° and 39°. What angle should the third corner have?
A.
88
B.
39
C.
68
D.✓ Correct
78
Detailed Explanation
Choice D is correct. The sum of angles in a triangle is always 180°. 1. Two known angles: 63° + 39° = 102° Third angle: 180° - 102° = 78° Therefore, the third angle is 78°.
Key Steps:
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The correct answer is 78
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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