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Lines, Angles, and Triangles

SAT Math· difficulty 2/5

In an isosceles triangle, the two base angles are equal. If the vertex angle measures 40°40°, what is the measure of each base angle?

  • A

    70°70°

    check_circle
  • B

    50°50°

  • C

    60°60°

  • D

    80°80°

Explanation

The angles sum to 180°180°. The two base angles are equal, so each is frac180°−40°2=70°\\frac{180° - 40°}{2} = 70°.

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