Question

4. Calcula el área de la figura:
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Answer 1

Explicación paso a paso:

R=diametro/2=50/2

R=25

area=(pi)R^2/2

area=625(pi)/2

Answer 2

$r = 25cm ^{2} \\ \\ \pi {r}^{2} = \pi(25cm ) ^{2} \\ = 1963.49cm ^{2} \\ \frac{1963.49cm ^{2} }{2} = 981.7477cm ^{2}$

espero te sirva