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Lines, Angles, and Triangles

SAT Math· difficulty 3/5

The angles of a triangle are (2x)°(2x)°, (3x)°(3x)°, and (4x)°(4x)°. What is the value of xx?

  • A

    15

  • B

    30

  • C

    20

    check_circle
  • D

    25

Explanation

Angles of a triangle sum to 180°180°: 2x+3x+4x=1802x + 3x + 4x = 180, so 9x=1809x = 180, giving x=20x = 20.

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