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maka keliling K = 2(5x + 3x)=16x
48 = 16 x
x = 3 cm
jadi p = 5.3 = 15 cm dan l = 3.3 = 9 cm
maka luas
48=2(p+l)
(p+l)=48/2
(p+l)=24
P=5/8 x 24=15
l=3/8 x 24=9
L=p x l
=15 x 9
=135