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d = √900 cm × 2
d = 30 cm × 2
d = 60 cm
2826 = 3,14 x r²
r² = 2826/3,14
r² = 900
r = √900
r = 30
maka , jari2 nya adalah 30 cm
jadi, diameter = 2r = 2 x 30 cm = 60 cm