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Kell = 22/7 × 35 cm
Kell = 110 cm
Luas = 1/4 × π × (1/2 d)²
Luas = 1/4 × 22/7 × (17,5 cm)²
Luas = 1/4 × 22/7 × 306,25 cm²
Luas = 240,5 cm