向量法again
kde235
2026-04-25 08:31:42
( reads)
S_ABCD = AB x AD
= (AB+BE) x AD ### BE//AD
= AE x AD
= AE x (AD + DF) ### DF//AE
= AE x AF
= 3*sqrt(2) * 4*sqrt(2)
= 24
贫论贫论
2026-04-25 19:36:15向量法很棒，可以懂