Step-by-step explanation:
1.
[tex]a \: = \: \pi {r}^{2}[/tex]
[tex]a \: = \: (3.14)(9)(9)[/tex]
[tex]a \: = \: (3.14)(81)[/tex]
[tex]a \: = \: 254.34 \: {cm}^{2} [/tex]
2.
[tex]a \: = \: \pi {r}^{2}[/tex]
[tex]a \: = \: (3.14)(6)(6)[/tex]
[tex]a \: = \: (3.14)(36)[/tex]
[tex]a \: = \:113.04 \: {inches}^{2} [/tex]
3.
[tex]a \: = \: \pi {r}^{2}[/tex]
[tex]a \: = \: (3.14)(4)(4)[/tex]
[tex]a \: = \: (3.14)(16)[/tex]
[tex]a \: = \: 50.24 \: { \:ft}^{2} [/tex]
4.
[tex]a \: = \: \pi {r}^{2}[/tex]
[tex]a \: = \: (3.14)(15)15)[/tex]
[tex]a \: = \: (3.14)(225)[/tex]
[tex]a \: = \: 706.5 \: {cm}^{2} [/tex]
5.
[tex]a \: = \: \pi {r}^{2}[/tex]
[tex]a \: = \: (3.14)(2)(2)[/tex]
[tex]a \: = \: (3.14)(4)[/tex]
[tex]a \: = \: 12.56 \: {m}^{2} [/tex]
6.
[tex]a \: = \: \pi {r}^{2}[/tex]
[tex]a \: = \: (3.14)(3.5)(3.5)[/tex]
[tex]a \: = \: (3.14)(12.25)[/tex]
[tex]a \: = \: 38.465 \: {m}^{2} [/tex]
Hope it would help.
