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jari-jari=7cm
luas lingkaran =πr^2
=22/7 x 7x7
=154 cm^2
keliling=πd=22/7x14=44 cm
jari-jari=20 cm
luas =πr^2
=3,14 x 20x20
=3,14x400
=1256 cm^2
keliling=2πr
=2x3,14x20
=125,6 cm