Doubt from Tetrahedron

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Q 2 and 3

Screenshot_2019-11-12-13-11-08-1

Screenshot_2019-11-12-13-11-30-1

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Screenshot_2019-11-12-13-11-37-1

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Please anyone try Q3

@Hari_Shankar Sir, @Jagdish_Singh Sir please see Q 3
Also find mistake in my approach
My approach - A' = A cos@ as we have to take projection at angle @ and same for B' and C'.
Now I have applied the formula of volume of tetrahedron to the vectors AB', B'C' and C'D' and similarly for the A'BCD Tetrahedron but i am unable to get the answer!!!

I am getting answer as \displaystyle \frac{V_{AB'C'D'}}{V_{A'BCD}} = \cos \alpha.

Ans is given 1 but sir please share your approach