- A50
- B45
- C100
- D55
Step-by-Step Solution
Interior A = 180 - 100 = 80; interior B = 180 - 130 = 50. Interior C = 180 - 80 - 50 = 50°. (Also C = exterior A + exterior B - 180 = 100 + 130 - 180 = 50.)
Answer: A) 50
In triangle ABC, the exterior angle at A is 100° and the exterior angle at B is 130°. Find the interior angle C.
Class 7Exterior Angle PropertyTriangles
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