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n = 9
s = ?
s = n . K
= 9 2 π r
= 9*2*22/7*35
= 1980 cm
= keliling lingkaran × putaran
= (2 × π × r) × 9
= (2 × 22/7 × 35) × 9
= (2 × 110) × 9
= 220 × 9
= 1980 cm
= 19,8 m