Question

In ΔCDE, the measure of ∠E=90°, DC = 13, CE = 12, and ED = 5. What is the value of the cosine of ∠D to the nearest hundredth

Answer 1

0.385

Explanation:

1- Rule of getting the cosine of an angle is

Adjacent side ÷Hypotenuse

2-Cosine of <D= 5÷13≈0.38