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Key Stage 2

Meaning

Pi (π) is the ratio of the circumference of a circle to its diameter.

About π

π is roughly 3.14.

Key Stage 3

Meaning

Pi (π) is the ratio of the circumference of a circle to its diameter.

About π

π is roughly 3.142.

Key Stage 4

Meaning

Pi (π) is the ratio of the circumference of a circle to its diameter.

About π

π is roughly 3.14159265359 correct to 12 significant figures.