Can anyone help me on how to proof this:

If r and s are any points on a circle with center O and radius Ot, then Or is congruent to Os.

The only thing that I can think of is using Euclid's Postulate II.

Thank you.

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- September 2nd 2008, 10:07 AM #1

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- September 2nd 2008, 04:05 PM #2

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Sorry, but this is another case why other people think Math is hard.

Because we all know that the radius of a circle is constant. So any two radii, or any 3 radii, or any razillion radii of the same circle are congruent.

Why should Euclid's Postulate II be involved in proofing this?