Radius of Great Circle equals Radius of Sphere

Theorem

Let $S$ be a sphere.

Let $C$ be a great circle of $S$.

Then the radius of $C$ equals the radius of $S$ .

Proof

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): great circle
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): great circle