Math Is Fun Forum

{7/3}

Member

Registered: 2013-02-11

Posts: 210

What is this?

"in any circle a central angle is proportional to the arc it creates"-is this a postulate or proposition?

Last edited by {7/3} (2013-05-25 23:48:23)

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There are 10 kinds of people in the world,people who understand binary and people who don't.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,619

Re: What is this?

In book 3 of the Elements, Euclid treats it as a postulate (definition).

definition 11. Similar segments of circles are those accepting equal angles,

Bob

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{7/3}

Member

Registered: 2013-02-11

Posts: 210

Re: What is this?

Thanks.

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There are 10 kinds of people in the world,people who understand binary and people who don't.