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What is the measure of each exterior angle of an equilateral triangle?

Class 9Exterior Angle of a TriangleGeometry — Lines and Angles
  • A90°
  • B120°
  • C180°
  • D60°

Step-by-Step Solution

Each interior angle is 60°, so each exterior angle is 180° − 60° = 120°. Check: ° = 360°.
Answer: B) 120°

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