First one:
The Perimeter is 15 x4 = 60 feet
She also wants TWO diagonals of the square room
by the pythagorean theorem for R triangles the diagonal can be found as
a^2 + b^2 = c^2 Where a and b are sides of the triangle and c is the diagonal
15^2 + 15^2 = c^2
c= sqrt(15^2 +15^2) = 21.21 feet she needs TWO of these so 42.42 ft added to the 60 ft above results in 102.42 ft
each roll is 20 feet, so she will need 102.42 ft / 20ft/roll = 5.12 rolls ~~~ 6 rolls
