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46 = 2(p+l)
46/2 = 14 + l
23 = 14 + l
lebar = 23-14
lebar = 9 cm.
= 2(14) + 2l
= 2l + 28
2l + 28 = 46
2l = 46 - 28
2l = 18
l = 18 / 2
l = 9 cm