Find the Definite Integral by Computing an Area $$\int _ { 0 } ^ { 7 } \sqrt { 49 - x ^ { 2 } } d x$$

Multiple Choice

Find the definite integral by computing an area.
- $$\int _ { 0 } ^ { 7 } \sqrt { 49 - x ^ { 2 } } d x$$

A) $\frac { 49 } { 4 } \pi$
B) $49 \pi$
C) $\frac { 49 } { 4 }$
D) $98 \pi$