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2(3+l + l ) =34
2 (3 + 2l ) = 34
6 + 4l = 34
4l = 34 - 6
4l = 28
l = 28/4
l = 7 cm
lebar = 7 cm
panjng = 7 + 3 = 10 cm
luas = p x l
= 10 x 7
= 70 cm²