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L lingkaran = phi r kuadrat
= 3,14 x 17,5 kuadrat
= 3,14 x 306,25
= 961,625 cm persegi
r = 1/2 d
= 17,5
L = phi.r2
= 22/7.17,5.17,5
=22.2,5.17,5
=962,5 cm2