9
Answer: DSet 3: Triangles (Beginner)
Explanation
PROBLEM
A triangle has angles of 51 degrees and 63 degrees. What is the third angle?
A triangle has angles of 51 degrees and 63 degrees. What is the third angle?
A.
69
B.
65
C.
64
D.✓ Correct
66
Detailed Explanation
Choice D is the best answer. Third angle = 180 - 51 - 63 = 66 degrees
Why others are wrong:
A: 69 is incorrect because it does not satisfy the equation.
B: 65 is incorrect because it does not satisfy the equation.
C: 64 is incorrect because it does not satisfy the equation.