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lebar = 3/8 x 40 m = 15m :2 =7,5
2(5a+3a)=40
5a+3a=20
8a=20
a=20/8
p=5a ⇒ 5(20/8)=100/8=12,5 m
l=3a ⇒ 3(20/8)=60/8=7,5 m