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L = 2826 cm
maka
L = π x r²
2826 = 3,14 x r²
r² = 900
r = 30
K= 2 x π x r
= 2 x 3,14 x 30
= 188,4 cm
jadi kelilingnya adalah 188,4 cm
2826 = 3.14 r2
2826/ 3.14 = r2
900 = r2
(akar) 900 = r
30 = r
keliling lingkaran = .d
K = 3.14 x 60
K = 188.4