This rectangular prism is intersected by a plane that contains points N, P, U, and R.

What is the perimeter of the cross section?

Round to the nearest tenth.

Two of the parallel sides of the plane will each equal NP = 6

The other two parallel sides will each equal PU = sqrt ( 6^2 + 15^2) = sqrt (36 + 225) =

sqrt ( 261)

So.....the perimeter of NPUR = 2 [ 6 + sqrt (261) ] ≈ 44.3 ft