#### Answer

Exact: $A=49\pi$ cm sq
Approximation: $A=153.86$ cm sq

#### Work Step by Step

Exact:
$A=\pi r^{2}$
$A=\pi\times 7^{2}$
$A=49\pi$ cm sq
Approximation:
We can substitute $3.14$ for $\pi$ in our exact answer to get a real number approximation.
$A\approx49\times3.14$
$A\approx153.86$ cm sq