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The angles of a triangle are in arithmetic progression and the largest angle is twice the smallest. What is the smallest angle?

Competition practiceGeometry
  • A40°
  • B30°
  • C60°
  • D45°

Step-by-Step Solution

Angles in AP have the middle angle 60°, so smallest + largest = 120°. With largest = 2 × smallest: °.
Answer: A) 40°

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