Use the triangle in the illustration for the exercise. a = 21.0 m, b = 42.0 m, c = 47.0 m Find cos A. (Round your answer to four deci

When refering to right triangles, cos is defined to be the value of the adjacent side divided by the value of the hypotenuse.

In this triangle, c is the hypotenuse and b is the side adjacent to ∠A, so cos(∠A) = b/c  =  42.0/47.0

(Final calculation left for your.)