#### 150 cm²
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- Use Heron’s formula: \( s = \frac{60}{2} = 30 \).
- Area = \( \sqrt{30(30-15)(30-20)(30-25)} \).
- Area = \( \sqrt{30 \times 15 \times 10 \times 5} = \sqrt{22500} = 150 \) 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 \( h = 2r \).
- \( \pi r^2 (2r) = 288\pi \).
