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Mathematics for IGCSE & O level - Using A Calculator (Section 2 - No. 42)

In the formula for the surface area of a sphere, A = 4πr², what does π represent?
The area of the sphere
The radius of the sphere
A mathematical constant (approximately 3.14159)
The diameter of the sphere

توضیح

π (pi) is a mathematical constant, approximately 3.14159.

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