Question

The cosine of the complimentary angle to 57° a. 0.98 c. -0.01 b. 0.13 d. 0.84

Answer 1

Since these are complementary angles (both summing to 90°)

This is equal to sin57° which is approximately:

sin57≈0.838 or 0.84 to nearest hundredth...

(because sinα=cos(90-α))

Answer 2

Complementary angles: angles whose measures add up to 90 degrees.
x+57=90
x=33 degrees

cosine(33) = 0.83867056794542
0.83867056794542 rounded to the nearest hundredth is 0.84

The correct answer is D) 0.84