1) Aria romb = (d1*d2)/2 => Aria = 12*24 / 2 => Aria = 144
2) Aria paralelogram = AB * d(D,AB) => 56 = 7 * d(D, AB) => d(D, AB) = 56/7 => d(D, AB) = 8
3) Aria dreptunghi = L * l => Aria = 8 * 5 => Aria = 40
4) Aria tr dr is = c *c / 2 => 18 = c ^ 2 / 2 => c ^ 2 = 36 => c = 6
