![\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ r=10 \end{cases}\implies A=\pi 10^2\implies A=100\pi \\\\\\ \stackrel{\textit{half of that for a semicircle}}{A=\cfrac{100\pi }{2}}\implies A=50\pi \implies \stackrel{\pi =3.142}{A=157.1}](/tpl/images/0295/9226/652b1.png)
Read the following picture below and use 3.142 instead of
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Mathematics, 07.10.2019 03:30 GiaTeyy6536
Read the following picture below and use 3.142 instead of
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