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6.7: Області комбінованих фігур за участю півкіл
https://ukrayinska.libretexts.org/%D0%94%D0%BE%D0%BA%D0%BE%D0%BB%D0%B5%D0%B4%D0%B6%D0%BD%D0%B0_%D0%BE%D1%81%D0%B2%D1%96%D1%82%D0%B0/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B0/%D0%93%D0%B5%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D1%96%D1%8F/06%3A_%D0%9A%D0%BE%D0%BB%D0%B0/6.07%3A_%D0%9E%D0%B1%D0%BB%D0%B0%D1%81%D1%82%D1%96_%D0%BA%D0%BE%D0%BC%D0%B1%D1%96%D0%BD%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%85_%D1%84%D1%96%D0%B3%D1%83%D1%80_%D0%B7%D0%B0_%D1%83%D1%87%D0%B0%D1%81%D1%82%D1%8E_%D0%BF%D1%96%D0%B2%D0%BA%D1%96%D0%BB
\(\begin{aligned} A&=\pi r^2 \\ A&=3.14(4)^{2} \\ A&=3.14(16) \\ A&=50.24\text{ sq. \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=48+25.12 \\ A&=73.12\text{ sq. \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=192+5...\(\begin{aligned} A&=\pi r^2 \\ A&=3.14(4)^{2} \\ A&=3.14(16) \\ A&=50.24\text{ sq. \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=48+25.12 \\ A&=73.12\text{ sq. \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=192+56.5 \\ A&=248.5\text{ sq. \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=36+28.26 \\ A&=64.26\end{aligned}\) \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=15+3.53 \\ A&=18.53\text{ sq. \(\begin{aligned} A&=A_{r}+A_{sc} \\ A&=64+25.12 \\ A&=79.12\text{ square inches } \end{aligned}\)