Two Sides of a Right Triangle ABC (C Is the Right

Multiple Choice

Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given
angle. Give exact answers with rational denominators.
-Find $\sin \mathrm { A }$ when $a = 8$ and $b = 7$ .

A) $\frac { \sqrt { 113 } } { 7 }$
B) $\frac { \sqrt { 113 } } { 8 }$
C) $\frac { 8 \sqrt { 113 } } { 113 }$
D) $\frac { 7 \sqrt { 113 } } { 113 }$