5
Answer: DSet 4: Triangles (Beginner)
Explanation
PROBLEM
A triangle has angles of 70 degrees and 40 degrees. What is the third angle?
A triangle has angles of 70 degrees and 40 degrees. What is the third angle?
A.
69
B.
71
C.
73
D.✓ Correct
70
Detailed Explanation
Choice D is the best answer. Third angle = 180 - 70 - 40 = 70 degrees
Why others are wrong:
A: 69 is incorrect because it does not satisfy the equation.
B: 71 is incorrect because it does not satisfy the equation.
C: 73 is incorrect because it does not satisfy the equation.