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Mathematics for IGCSE & O level - The Four Operations (Section 8 - No. 42)

What is the area of a circle with a diameter of 10 cm? (Use π ≈ 3.14)
31.4 cm²
62.8 cm²
78.5 cm²
100 cm²

Wyjaśnienie

Radius = 5 cm, area = π * radius² = 3.14 * 5^2 = 78.5 cm²

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