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lebar = p cm
keliling = 2(panjang+lebar)
90 = 2(2p+p)
90 = 4p+2p
90 = 6p
p = 15
panjang = 2xp = 2x15 = 30 cm
2 ( 2p + p) = 90
2 ( 3p ) = 90
6p = 90
p = 90/6
p = 15
panjang = 2 x 15 = 30 cm