Digital SAT Math Practice Question #2553
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Geometry & Trig Rule: Always sketch the triangle or circle and check for standard Pythagorean triples (3-4-5, 5-12-13, 7-24-25, 8-15-17).
By the complementary angle theorem, in any right triangle, $\sin A = \cos(90^\circ - A) = \cos B$. Thus $\cos B = 3/5$....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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