Explicación paso a paso:
Área:
[tex]a = (\pi {r}^{2} ) = (\pi)( \frac{1}{4} \div \frac{2}{1} ) = (\pi)( \frac{1}{8} ) = \frac{\pi}{8} = 0.3926990817 {m}^{2} [/tex]
Perímetro:
[tex]p = (\pi) (d) = \pi ( \frac{1}{4} ) = \frac{\pi}{4} = 0.7853981634m[/tex]
