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81 = 2(p+l)
81/2 = p+l
panjang =5x
lebar=4x
p+l =81/2
5x+4x =81/2
9x = 81/2
x= 9/2
luas =p×l
luas =5×4×x^2
luas =20×81/4
luas =5×81
luas =.............