Back to Complementary angle relationship (sin x = cos(90-x)) — Problem 3 · Task Set 7

Complementary Angle Relationship

Grade 10·21 problems·~30 min·Digital SAT Math·topic·sat-geotrig-rt-comp

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Recall / Warm-Up

In a right triangle, the right angle is at vertex $C$ . The two acute angles are $A$ and $B$ , where $B = 90\degree - A$ .
The side opposite $A$ has length 3 and the hypotenuse has length 5.

What is $\\cos(B)$ ?

$\\dfrac{4}{5}$

$\\dfrac{3}{5}$

$\\dfrac{3}{4}$

$\\dfrac{5}{3}$