- A180°
- B270°
- C360°
- D540°
Step-by-Step Solution
Each exterior + interior = 180, for 3 vertices = 540°. Subtract interior sum 180°: 540 - 180 = 360°.
Answer: C) 360°
The sum of all three exterior angles of a triangle (one at each vertex) is always:
Class 9Angle Sum of a TriangleGeometry — Lines and Angles
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