Question

Guys plz solve this with proper description.......................

Appropriate answer will be marked as BRAINLIEST......................


ANSWER IT AS SOON AS POSSIBLE

Answer 1

$p = 2\pi \: r - \frac{\pi \: r}{2} + 2r = 40\\ \\ \frac{3\pi \: r}{2} + 2r = 40 \\ 3\pi \: r + 4r = 80 \\ r(3\pi + 4) = 80 \\ r = \frac{80}{(3\pi + 4)} \\ now \: area = \pi{r}^{2} - \frac{ \pi{r}^{2} }{4} \\ = \frac{3\pi \: {r}^{2} }{4} \\ put \: r \: from \: above$