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11 Mar 2010 12:08:13 IST

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OA , OB, OC are the sides a rectangular paralleled whose diagonal are OO`, AA` , BB` , and

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01)OA , OB, OC are the sides a rectangular paralleled whose diagonal are OO`, AA` , BB` , and CC`.D` is the centre of rectangle AC`O`B` and D` is the centre of rectangle O`A`CB`. If the sides OA ,OB, OC are in the ratio 1:2:3, the angle DOD` =?

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सुपर मान

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Joined: 7 Nov 2009

Posts: 199

13 Mar 2010 10:47:56 IST

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OD vector= i + 1.5j + k and OD dash vector is i +3j + 0.5k . now use dot product

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