This rectangular prism is intersected by a plane that contains points D, E, K, and L.
What is the perimeter of the cross section?
Edges EK and DL of the plane = sqrt (5^2 + 4^2) = sqrt (41) m
And edges DE and KL of the plane = 12 m
So.....the perimeter of DEKL = 2 ( sqrt (41) + 12) ≈ 36.81 m
