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luas lingkaran = pi (22/7 atau 3,14) x r^2
= 22/7 x 17,5 x 17,5
= 962,5 cm^2
r = diameter /2
r = 35/2
r =17,5
luas = 22/7 x 17,5²
luas = 22/7 x 306,25
luas = 6737,5/7
luas = 962,5cm²