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616 = 22/7 x r²
616 x 7/22 = r²
196 = r²
14 = r
diameter = 2r
= 2 x 14
= 28
Diameter Lingkaran = ( √ Luas ÷ ) × 2
= ( √ 616 ÷ ) × 2
= ( √ 616 × ) × 2
= ( √ 196 ) × 2
= 14 × 2
= 28 Cm