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maka p+l= 38/2 = 19
p=5+l
l=7
maka p=5+7= 12
luas = 12x7 = 84 cm^2
K=2(p+l)
38=2((5+l)+l)
19=5+2l
14=2l
L=7 cm
P=5+l=5+7=12cm
Luas=A=p*l=12*7=84cm