Lines, Angles, and Triangles

SAT Math· difficulty 2/5

In a parallelogram, opposite angles measure xx and 3x403x-40. What is xx?

  • A

    3030

  • B

    2020

    check_circle
  • C

    6060

  • D

    4040

Explanation

Opposite angles equal: x=3x40x=3x-40, so 2x=402x=40, x=20x=20.

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