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In the triangle ABC, the angle A is three times of B. Angle C is 60°. Find angle A?
  1. 40°
  2. 90°
  3. 80°
  4. None of these
Explanation
  • The sum of angles in a triangle is 180°, so:
    A + B + C = 180° → A + B + 60° = 180° → A + B = 120°

  • Given A = 3B, substitute: 3B + B = 120° → 4B = 120° → B = 30°, so A = 90°.

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