Lines, Angles, and Triangles

SAT Math· difficulty 2/5

Two angles of a triangle measure 45°45° and 65°65°. What is the measure of the third angle?

  • A

    70°70°

    check_circle
  • B

    80°80°

  • C

    90°90°

  • D

    60°60°

Explanation

The interior angles of a triangle sum to 180°180°. So the third angle is 180°45°65°=70°180° - 45° - 65° = 70°.

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