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Let A B C D be a tetrahedron such that ...

Let `A B C D` be a tetrahedron such that the edges `A B ,A C` and `A D` are mutually perpendicular. Let the area of triangles `A B C ,A C D` and `A D B` be `3, 4` and `5sq`. `units`, respectively. Then the area of triangle `B C D` is
a.`5sqrt(2)`
b. `5`
c. `(sqrt(5))/2`
d. `5/2`

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