S = x* y = 24; d^2 = x^2 + y^2= 73; x* y =24; ⇒ x =24/y; x^2 + y^2 = 73; 576/ y^2 + y^2 = 73; y^2 = t >0; 576 / t + t = 73; t^2 - 73 t + 576 =0; D = 73^2 - 4*1*576= 5329-2304 =3025=55^2; t1= (73+55)/2=64; ⇒y^2 = 64; ⇒y = 8; ⇒x=24/8 =3; t2=(73-55)/2= 9; ⇒ y^2 = 9; ⇒ y= 3; ⇒ x= 24/3 = 8. P = 2( x+y) = 2( 8 + 3 ) = 2*11 = 22