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200,96=3,14 x rkuadrat
rkuadrat= 200,96 : 3,14
= 64
r= √64
=8
maka keliling= 2 x phi x r
= 2 x 3,14 x 8
= 50,24
200,96 cm² = 3,14 x r²
r² = 200,96 cm² : 3,14 = 64 cm²
r = √64 cm² = 8 cm
Keliling = 2πr
= 2 x 3,14 x 8 cm
= 50,24 cm