1.

A,B,C,D are 4 complanar points and A:B:C:D are their projectioins on any plane. If alpha is the angle between plane of ABCD and plane of projections then ("Volume of tetrahedron AB'C'D' ")/("Volume of tetrahedronA'BCD")=

Answer»

1
2
`2COS ALPHA`
`COS alpha`

ANSWER :a


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