Question

I got 57.12, but it’s not an answer...I am confusion

Answer 1

Check the picture below.

$\bf \stackrel{\textit{area of the semicircle}}{\frac{\pi r^2}{2}}~~~~+~~~~\stackrel{\textit{area of the triangle}}{\frac{1}{2}bh} \\\\\\ \stackrel{\textit{area of the semicircle}}{\frac{\pi 4^2}{2}}~~~~+~~~~\stackrel{\textit{area of the triangle}}{\frac{1}{2}(12)(8)} \\\\\\ 8\pi +48\qquad \approx\qquad 73.1327412287$