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210 = 2(65 + l )
210 = 130 + 2l
80 = 2l
l = 40cm
210 = 2(65+l)
210 = 130 + 2l
2l = 210 - 130
2l = 80
l = 80/2
l = 40m
pembuktian
keliling = 2(p+l)
keliling = 2(65+40)
keliling = 130 + 80
keliling = 210m