Here again are the multiples of 6, 0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, 96,… If we divide any of these multiples by 6, we get a quotient with remainder zero.
A^2 + b^2 = c^2 20^2 = 400 52^2 = 2704 400 + b^2 = 2704 2704 - 400 = 2304 So you need the square root of 2304 which is 48 so the length of the other leg is 48 ft.