共50条信息
已知长方体\(ABCD-{A}{{{'}}}{B}{{{'}}}{C}{{{'}}}{D}{{{'}}},A{A}{{{'}}}=AD=1,AB=2\),点\(E\)为\(DC\)中点.
\((1)\)求证:\({B}{{{'}}}E\bot \)面\(AE{D}{{{'}}}\);
\((2)\)求点\({C}{{{'}}}\)到面\(AE{D}{{{'}}}\)的距离.
已知\(A\),\(B\)两地都位于北纬\(\dfrac{\pi }{4}\),又分别位于东经\(\dfrac{\pi }{6}\)和\(\dfrac{\pi }{3}\),设地球半径为\(R\),求\(A\),\(B\)两点间的球面距离.
如图,在四棱锥\(P-ABCD\)中,\(O∈AD\),\(AD/\!/BC\),\(AB⊥AD\),\(AO=AB=BC=1\),\(PO=\sqrt{2}\),\(PC=\sqrt{3}\).
\((\)Ⅰ\()\)证明:平面\(POC⊥\)平面\(PAD\);
\((\)Ⅱ\()\)若\(CD=\sqrt{2}\),三棱锥\(P-ABD\)与\(C-PBD\)的体积分别为\(V_{1}\)、\(V_{2}\),求\(\dfrac{{{V}_{1}}}{{{V}_{2}}}\)的值.
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