Digital SAT Math Practice Question #2555
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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 Pythagorean theorem: $DF = \sqrt{13^2 - 5^2} = \sqrt{169 - 25} = 12$. $\tan D = \frac{\text{opposite}}{\text{adjacent}} = \frac{EF}{DF} = \frac{5}{12}$....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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