Question

I'm stuck pls help me ​

Answer 1

`\textit{area of a circle \Large A}\\\\ A=\pi r^2 ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=4 \end{cases}\implies A=\pi (5)^2\implies \stackrel{ Exact }{A=25\pi} \implies \stackrel{ approximate }{A\approx 78.5} \\\\[-0.35em] ~\dotfill\\\\ \textit{area of a circle \Large B}\\\\ A=\pi r^2 ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=6 \end{cases}\implies A=\pi (6)^2\implies A=36\pi \implies A\approx 113.1`