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Cara keliling persegi 2(p+l)
=72:2-8
lebar = x - 8
2 ( p + l ) = keliling
2 ( x + x - 8 ) = 72
4x - 16 = 72
4x = 72 + 16
x = 88 ÷ 4 = 22
jadi,
panjang = x = 22 cm
lebar = x - 8 = 22 - 8 = 14 cm