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20×100=2000÷500=4
keliling=5×2=10 4×2=8 10+8=18
luas=5×4=20
a.18
b.20
maaf kalo salah
20×2=40
50×40=2000
500÷2000=40
HASILNYA =40 METER
KLO SALAH JANGAN MARAH