Math: Geometry and Trigonometry

SAT Question of the Day for November 7, 2026

Two angles are supplementary. If one angle measures 137∘137^\circ, what is the measure of the other angle?
  1. A.43∘43^\circCorrect answer
  2. B.47∘47^\circ
  3. C.53∘53^\circ
  4. D.137∘137^\circ

Explanation

Supplementary angles sum to 180∘180^\circ. The other angle is 180∘−137∘=43∘180^\circ - 137^\circ = 43^\circ. The value 53∘53^\circ results from a subtraction error. The value 47∘47^\circ comes from confusing supplementary (180∘180^\circ) with complementary (90∘90^\circ) and computing 90∘−43∘=47∘90^\circ - 43^\circ = 47^\circ. Repeating 137∘137^\circ mistakes the pair for equal angles rather than supplementary ones.

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