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L = πr²
440 = 22/7 × r²
r² = 440 : 22/7
r² = 440 × 7/22
r² = 140
r = √140 = 11,83
b. L = 616
L = πr²
616 = 22/7 × r²
r² = 616 : 22/7
r² = 616 × 7/22
r² = 196
r = √196 = 14
b. 14 cm
saya kurang paham jawaban a, saya paham jawaban b.