Question 849233
The diagonal forms the hypotenuse of a right triangle. The length forms a leg.

Pythagorean theorem.

36^2 + b^2 = 39^2 

b^2 = 39^2 -36^2

{{{b = sqrt(39^2 - 36^2) = 15}}}

Since we have a rectangle with length 36 m and width 15 m

P = 2l + 2w

P = 2(36) + 2(15)


{{{highlight(P = 102 m)}}}