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diketahu : L= 490 cm²
ditanya : r....?
jawab :
L = πr²
490 = 22/7 x r²
r² = 490/ 22/7
r² = 490 x 7 /22
r² = 3430/22 = 155,1
r = √155,1
r = 12,48 cm.
keterangan π = 22/7 dan 3,14.
perksa lagi ya