Question

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Answer 1

Explicación paso a paso:

1.

$S=\frac{ {(8 \: m)}^{2} }{2} \\ S= \frac{64 \: {m}^{2} }{2} \\ \boxed{S=32 \: {m}^{2} }$

2.

$S= \frac{ \pi{( \frac{a}{2}) }^{2} }{2} \\ S=\pi \frac{ \frac{ {a}^{2} }{4} }{2} \\ \boxed{S= \frac{ {a}^{2} }{8} }$