Question

The picture shows a triangular island.
Which expression shows the value of c?

b over sin 45 degrees

b over cos 45 degrees

a cos 45°

a sin 45°

Answer 1

b over cos 45 degrees
-----------------
The cosine of an acute angle of a right triangle is the ratio of the adjacent leg length to that of the hypotenuse.

cos (45) = b /c
b = (cos(45)) * c
c = b / [cos (45) ]