a) P = r² r = 30cm : 2 = 15cm
P = 3,14 × (15cm)²
P = 3,14 × 225cm² = 706,5cm²
b) 706,5 : 18 = 39,25 cm² 39,25cm² - 1 zł 1zł - 100gr
100 gr : 39,25 ≈ 3gr
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a) P = r² r = 30cm : 2 = 15cm
P = 3,14 × (15cm)²
P = 3,14 × 225cm² = 706,5cm²
b) 706,5 : 18 = 39,25 cm² 39,25cm² - 1 zł 1zł - 100gr
100 gr : 39,25 ≈ 3gr