The wall is a rectangle, so by the pythagorean theorem, the diagonal squared minus the height squared equals the width squared. This gives a width of 42.80 feet. The area of the wall is width (42.80 ft) x height (8.3 ft), equal to 355.26 square ft. The can covers 21.5 square feet, so John needs 16.52 cans to cover the wall. As he can't buy half a can, John should purchase 17 cans of spraypaint.<span>The wall is a rectangle, so by the pythagorean theorem, the diagonal squared minus the height squared equals the width squared. This gives a width of 42.80 feet. The area of the wall is width (42.80 ft) x height (8.3 ft), equal to 355.26 square ft. The can covers 21.5 square feet, so John needs 16.52 cans to cover the wall. As he can't buy half a can, John should purchase 17 cans of spraypaint.</span>
Diagonal of a wall: d=43.6ft Height of a wall: h=8.3ft Length of a wall: l d²=h²+l², l²=d²-h², l=√(d²-h²) l=√(43.6²-8.3²), l=42.8ft Area of a wall is: l*h=8.3*42.8=355.24ft² One spray can can cover 21.5ft². 355.24/21.5=16.52 John will need 17 cans of spray.
To get the answer we can use proportion 10 large ------------- 14 small x large -------------- 35 small crossmultiply 10*35=x*14 350=14x /:14 350:14=14x:14 25=x-its the answer
