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k=2(p+l)
p=210
l=210x1/3= 70
K=2(210+70)
k=2(280)
k= 560m
semoga membantu
l=1/3×210=70m
jd yg pagar yg dibutuhkan ==> keliling persegi panjang=2(210+70)=2×280=560m