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Keliling lingkaran :22/7 x diameter atau 2 x 22/7 x jari jari
contoh : diameter =28 cm
jari jari = 2 x diameter = 28 : 2 = 14 cm
Keliling : 22/7 x 28
= 88 cm
Luas lingkaran : (22/7 atau 3,14) x jari jari
= 22/7 x 14 x 14
= 44 x14
= 616 cm2
#smoga bner