原帖由 joseflin 于 2007-9-25 16:01 发表 http://www.3dportal.cn/discuz/images/common/back.gif% `$ v0 @) K) H5 C* n' ~" D
1. 作84X72X64之三角形ABC" N& g; g" B0 D" l1 `7 I
9 R H' V x3 O a- l
5.If ( AB+AC+BC)=(AD+AE)+ H X7 k7 H2 |1 C3 b/ A
Then BC=AD+AE-AB-AC=110+110-72-84=64