共50条信息
在正方体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,\(E\)是\(C_{1}C\)的中点,则直线\(BE\)与平面\(B_{1}BD\)所成的角的正弦值为( )
如图,四棱柱\(ABCD-{A}_{1}{B}_{1}{C}_{1}{D}_{1} \)中,底面为正方形,侧棱垂直于底面,底面边长为\(1\),\(A{B}_{1} \)与底面\(ABCD\)成\(60^{\circ}\)角,则\(A{{B}_{1}}\)与平面\({{A}_{1}}BC{{D}_{1}}\)所成的角为\((\) \()\)
如图,在正方体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,二面角\(C_{1}-AB-D\)的平面角等于( )
在长方体\(ABCD-A\)\({\,\!}_{1}\)\(B\)\({\,\!}_{1}\)\(C\)\({\,\!}_{1}\)\(D\)\({\,\!}_{1}\)中,\(AB\)\(=\)\(BC\)\(=2\),\(AA\)\({\,\!}_{1}=1\),则\(BC\)\({\,\!}_{1}\)与平面\(BB\)\({\,\!}_{1}\)\(D\)\({\,\!}_{1}\)\(D\)所成角的正弦值为( ).
四棱锥\(S-ABCD\)的底面\(ABCD\)是正方形,各侧棱长与底面的边长均相等,\(M\)为\(SA\)的中点,则直线\(BM\)与\(SC\)所成的角的余弦值为
如图,在正方体\(ABCD—A_{1}B_{1}C_{1}D_{1}\)中,\(E\)是\(AB\)的中点,\(F\)在\(CC_{1}\)上,且\(CF=2FC_{1}\),点\(P\)时侧面\(AA_{1}DD_{1}(\)包括边界\()\)上一动点,且\(PB_{1}/\!/\)平面\(DEF\),则\(\tan ∠ABP\)的取值范围是
进入组卷