[tex]P=83.12ft[/tex]
1) This is a matter of finding the Perimeter. Note that the semicircle perimeter is given by:
[tex]P_{semicicle}=\frac{2\pi r}{2}=\pi r[/tex]
2) So for this garden, we can tell the formula that yields the perimeter is:
[tex]\begin{gathered} P=2b+h+\pi r,r=\frac{16}{2}=8 \\ P=2(21)+16+3.14\cdot8 \\ P=83.12ft \end{gathered}[/tex]
Note that there are two "bases" and one height and a semicircle.
