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72=8x
x= 9
L = P x L
p = 3(9)
l = 1(9)
L = 27 x 9 = 243 cm2
2(panjang+lebar)=72
panjang + lebar = 36
panjang= 3/4×36 = 27
lebar = 36-27 =9
luas 27×9 =243cm2