Question

Find the cosine of angle R. Reduce the answer to the lowest terms.

Answer 1

Cosine formula

`\cos (angle)=\frac{\text{ adjacent side}}{\text{ hypotenuse}}`

Considering angle R, the adjacent side has a length of 9 units, and the hypotenuse of the triangle has a length of 15 units. Substituting this information into the above formula:

`\cos (m\angle R)=(9)/(15)=((9)/(3))/((15)/(3))=(3)/(5)`