Байарыст 2018-1 №4 вариант 12

Bayarystanov A.O. 2018-1 work #4 option 12
The vertices of the pyramid are A(7;4;9); B(1;-2;-3); C( -5;3;0); Given D(8;-7;-4). It is necessary to find: a)|AB|; b) BC; BD; c) S ABC; d) V ABCD.

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