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球与正三棱锥棱相切 球与三棱锥各个棱都相切
球与三棱锥各个棱都相切 AD⊥来BC,自SO⊥AD,PE⊥SA,连接百DP,则DP=PEAB=BC=AC=6,SA=4√3AD=3√3,DO=√3,SO=6,AO=2√3=SA2DP=PE=SP2DP=4-√3(度DP=4+√3不合题意,舍...
球与三棱锥各个棱都相切 AD⊥来BC,自SO⊥AD,PE⊥SA,连接百DP,则DP=PEAB=BC=AC=6,SA=4√3AD=3√3,DO=√3,SO=6,AO=2√3=SA2DP=PE=SP2DP=4-√3(度DP=4+√3不合题意,舍...