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9.20: Обсяг циліндрів
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$\begin{aligned}V&= \pi r^{2} h \\ V&= \pi (4)^{2} (16) \\ V&= \pi (16)(16) \\ V&= 256 \pi \\ V&= 803.84\text{ in}^{3}\end{aligned}$ \(\begin{aligned}V&= \pi r^{2} h \\ V&= \pi (5)^{2} (12) \\ V&= \... $\begin{aligned}V&= \pi r^{2} h \\ V&= \pi (4)^{2} (16) \\ V&= \pi (16)(16) \\ V&= 256 \pi \\ V&= 803.84\text{ in}^{3}\end{aligned}$ $\begin{aligned}V&= \pi r^{2} h \\ V&= \pi (5)^{2} (12) \\ V&= \pi (25)(12) \\ V&= 300 \pi \\ V&= 942 \text{ ft}^{3}\end{aligned}$ $\begin{aligned}V&= \pi r^{2} h \\ V&= \pi (6)^{2}(10) \\ V&= \pi (36)(10) \\ V&= 360 \pi \\ V&= 1130.4\text{ in}^{3}\end{aligned}$