"Let `A B C D` be a tetrahedron such that   the edges `A B ,A Ca n dA D` are mutually perpendicular.
Channel: Doubtnut
Date: 28/06/2020

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