Let the length of shortest side be - x length of medium side - x +3 length of longest side - x +3 + 11 so , according to question => x + x +3 + x +3 + 11 = 59 => x + x +x + 3 + 3 + 11 = 59 => 3x = 59 - 17 => 3 x = 42 => x = 42/3 => x = 14 Shortest side = x = 14 medium side = x + 3 = 14+3 = 17 longest side = x + 3 +11 = 14 + 3 + 11 = 28