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L:p×lebar
L:12×30: 360 cm(Luas)
panjang perseegi panjag = 12 cm + lebar
2p+2l = k
2(12+l)+2l = 120
24 + 2l + 2l = 120
4l = 120 - 24
4l = 96
l = 96/4
l = 24 cm
panjang = 24 + 12
= 36
luas = 24 . 12
=288 cm2