1.

OA, OB, OC are the sides of a rectangular parallelopiped whose diagonals are OO', AA' , BB' and CC' . D is the centre of the rectangle AC'O'B' and D' is the centre of the rectangle O'A'CB' . If the sides OA, OB , OC are in the ratio 1:2:3 , the angleangle DOD' is equal to

Answer»

`COS^(-1) (24)/(sqrt697) `
`cos^(-1) (22)/(sqrt619)`
`SIN^(-1) (24)/(sqrt697)`
`sin^(-1) (22)/(sqrt619)`

Answer :A


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