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= ¼ × 3,14 × 50² mm
= ¼ × 7850 mm
= 1962,5 mm²
L.Juring/L = SudutAOB/360°
L.Juring/1962,5 mm² = 72°/360°
L.Juring × 360° = 72° × 1962,5 (perkalian silang)
L.Juring × 360° = 141300
L.Juring = 141300 ÷ 360°
= 392,5