π ≈ 3,1
S = πR²
1) R² = (2,5)² = 2,5 * 2,5 = 6,25 см²
2) π * R² = 3,1 * 6,25 = 19,375 см²
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π ≈ 3,1
S = πR²
1) R² = (2,5)² = 2,5 * 2,5 = 6,25 см²
2) π * R² = 3,1 * 6,25 = 19,375 см²