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= 2 × 22 × 2 = 44 × 2 = 88 cm
Luas = phi × r × r = 22/7 × 14 × 14 (Angka 7 dan 14 dicoret menjadi = 22/1 × 2)
= 22 × 2 × 14 = 44 × 14 = 616 cm2