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keliling = p + l + p + l
70 = 5+l + l + 5+l + l
70 = 10 + 4l
70-10 = 4l
4l = 60
l = 60:4 = 15 m
panjang = 5 + l = 5+15 = 20
luas = 15 x 20 = 300 m
kll=70
kll= 2(l+5+l)
70=2(2l+5)
70/2=2l+5
35=2L+5
35-5=2l
30= 2L
15=L
p=15+5=20
luas=p.l= 20x15= 300
jadikan best ya