Topic: 180 degrees list of topics
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	The sum of the angles of a triangle		2009-05-18
		From mary: prove that the sum of the three angles inside any triangle always add up to 180 degrees? Answered by Harley Weston.
	The sum of the angles of a triangle is 180 degrees		1998-02-19
		From Quin Liu: How do you prove that the sum of the angles of a triangle is 180 degrees? Is there a proof? what is it? Answered by Chris Fisher.

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