Luas suatu lingkaran adalah 616 cm².jika v=22/7 maka kelilingnya adalah
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616cm² = 22/7 r²
r² = (616 cm² × 7)/22
r² = 196 cm²
r = √196 cm²
r = 14 cm
Kll = 2πr
Kll = 2 × 22/7 × 14 cm
Kll = 2 × 22 × 2 cm
Kll = 88 cm