Using the Pythagorean Theorem, you know that 3^2 + 4^2 = x^2, so 9 + 16 = x^2, which means that x = the square root of 25, which is 5. Then you add all three lengths of the triangle together to get the round trip. 3 + 4 + 5= 12.
Area of each wall is 10*8 = 80 square feet there are 5 walls so total wall area is 5*80=400 he needs two coats on each wall so he needs to cover 2*400=800 square feet
