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3,14 x 40 = 125.6
125.6 / 4 = 31.4 cm2
jika r = 20
maka d = 20x 2 = 40
maka keliling lingkaran = x 40 = 3,14 x 40 = 125,6
keliling daerah yg di arsir 1/4 x 125,6 = 31,4