求助！！(帮帮小弟一下了）
<p><b>在工地有一个不规则的凹形地形，我是用全站仪测得的三维数据，请问</b></p><p><b>以下20个点号所围成的图形的体积如何算出来呢？</b></p><p>点号XYZ①3860.4554436.346304.952②3857.6104436.636305.222③3862.6364424.259307.431④3857.0484423.837309.185⑤3862.6854414.847311.568⑥3854.6584416.162313.040⑦3852.5914424.890314.118⑧3852.0214414.100320.569⑨3867.3394408.434319.674⑩3864.0014425.690309.389①`3860.9384443.528303.776②`3851.7894444.102304.406③`3861.0914430.100304.972④`3855.5164431.918305.032⑤`3859.7934414.040309.218⑥`3856.8754410.856309.946⑦`3852.4434425.084313.886⑧`3840.9634413.068323.621⑨`3865.8914399.069322.969⑩`3868.5814423.939313.993</p> 你也太牛了吧?这个也可以搞上来
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