# Chapter 9 - Section 9.3 - Area, Volume, and Surface Area - Practice: 4

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

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