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Area = \( \sqrt{30(30-15)(30-20)(30-25)} \).
Area = \( \sqrt{30 \times 15 \times 10 \times 5} = \sqrt{22500} = 150 \) cm².
#### 150 cm²
A cylinder has a height twice its radius. If its volume is 288π cm³, find the radius.
Volume \( V = \pi r^2 h \), with \( h = 2r \).
\( \pi r^2 (2r) = 288\pi \).
\( 2r^3 = 288 \).
\( r^3 = 144 \).
\( r = \sqrt[3]{144} \approx 5.24 \) cm.
#### 5.24 cm