勾股。
by _HiKou_ @ 2022-09-28 18:56:53
@[zhchsh123](/user/552677) 24？
by AC_CSP @ 2022-09-28 19:10:55
24 或 84
by CE_WA_TLE @ 2022-09-28 19:17:34
@[zhchsh123](/user/552677) 勾股定理算出来底是 $5+9=14$，然后面积就是 $\frac{14\times12}{2}=84$。
by KingPowers @ 2022-09-28 19:21:36
@[King_Powers2021](/user/530180) 这是其中一种情况，还有一个就是 $24$，大意了（（
by KingPowers @ 2022-09-28 19:22:17