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2826=3,14.r²
r² = 2826/3,14
r² = 900
r=30 cm
keliling = 3,14 x 2(30) =3,14 x 60 = 188,4cm
= 2. 3,14. √2826/3.14
= 6,28 . √900
= 6.28 x 30
= 188.4 cm ²