- A55°
- B35°
- C145°
- D80°
Step-by-Step Solution
The exterior angle at A equals the sum of the interior opposite angles ∠B and ∠C: 100° = 45° + ∠C, so ∠C = 55°.
Answer: A) 55°
In the figure, side BA of △ABC is produced to E. The exterior angle ∠EAC is 100° and ∠B = 45°. Find ∠C.
Class 9Exterior Angle of a TriangleGeometry — Lines and Angles
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