Solution: The triangle with sides 9, 12, 15 is right-angled (since $9^2 + 12^2 = 15^2$). The area is $\frac{1}{2} \cdot 9 \cdot 12 = 54$. The altitudes correspond to $\frac{2 \cdot \text{Area}}{\text{side}}$, so:

Mon, 04 May 2026 10:56:57 +0000

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