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ditanya diameternya = ?
luas lingkaran = πr²
308cm² = 22/7 × r²
308cm²×7 =22r²
2156cm² = 22r²
r² = 2156cm²/22
r² = 98cm
r = √98cm
r ≈ 9,89cm
r ≈ 9,9cm
maka, diameter = 2r
diameter = 2×9,9cm
diameter ≈ 19,8cm
cm ke dm
= 19,8cm = 1,98dm
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