- A100°
- B140°
- C160°
- D120°
Step-by-Step Solution
Exterior angles are 180° − 40° = 140°, 180° − 60° = 120° and 180° − 80° = 100°. The largest sits next to the smallest interior angle: 140°.
Answer: B) 140°
The interior angles of a triangle are 40°, 60° and 80°. Which is its largest exterior angle?
Class 9Exterior Angle of a TriangleGeometry — Lines and Angles
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