Question

Consider triangle ABC, where angle C is a right angle. Without consulting a calculator, let sin(53°)=0.7986. Enter the angle measure B, in degrees, for COS (B)= 0.7986

Answer 1

We have a right triangle.
Then:
A+B+C=90
Data:
C=90º
A=53º

Therefore:
53º+B+90º=180º
B=180º-53º-90º
B=37º

Answer: B=37º

To check:
Cos 37º=0.79863551...≈0.7986