Question

Find the value of x round to the nearest 10th

Answer 1

x ≈ 12.9

Explanation:

In relation to the angle in this right triangle, the sides marked are the adjacent side and the hypotenuse. The relevant trig relation is ...

Cos = Adjacent/Hypotenuse

cos(72°) = 4/x

Multiplying by x/cos(72°), we have ...

x = 4/cos(72°)

x ≈ 12.9