Lines, Angles, and Triangles

SAT Math· difficulty 3/5

Two parallel lines are cut by a transversal. The angle between the transversal and one parallel line is 35°35°. What is the measure of the obtuse angle on the same line?

  • A

    55°55°

  • B

    125°125°

  • C

    145°145°

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  • D

    35°35°

Explanation

The acute angle is 35°35°; the obtuse angle on the same line forms a linear pair with it: 180°35°=145°180° - 35° = 145°.

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