[tex]\begin{gathered} A=3.14\times r^2 \\ \\ \text{if r=8} \\ A=3.14\times8^2 \\ A=3.14\times64 \\ A=200.96 \\ \\ \\ if\text{ r= 14.62} \\ A=3.14\times14.62^2 \\ A=671.16 \\ \\ \text{if d= 28, r= 14} \\ \\ A=3.14\times14^2 \\ A=615.44 \\ \\ \text{if d=15.4, r = }7.7 \\ \\ A=3.14\times7.7^2 \\ A=186.17 \end{gathered}[/tex]
