Tlong dijawab karna susah banget nihh

Dik :
kll = 76 cm
p = 2l-6
dit : luas
kll = 2 (p+l) = 2 (2l-6+l) = 76
3l-6 = 76/2 = 38
3l = 38 + 6 = 44
l = 44/3 = 14.67
p = 2l-6 = (2*14.67)-6 = 29.34-6 = 23.34
luas = p*l = 23.34*14.67 = 342.39