Perimeter of an lsoscels right triangle with two legs of length 20m

Right triangle always has the Hypotenuse as the longest side which means the other two in this case are 20 m long. We can calculate the length of hypotenuse by using Pythagoras Theorem

a = (b^2 + c^2)^0.5
a = (20^2 + 20^2)^0.5
a = 28.28

Thus Perimeter = a + b + c = 28.28 + 20 + 20 = 68.28 m