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The angle between two planes

Question

Find the angle between them the two planes below.

  • Plane 1 = r.(i + 3j – 2) = 1
  • Plane 2 = r.(2i + j – 3k) = 9

 

Answer

  1. 38.21

Notes:

cos z = (Unit vector of z1)*(Unit vector of z2)

 

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