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- Thread starter Bashyboy
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Well, the sum of angles in a triangle.

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- #4

SteamKing

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If the figure is closed and it's got three sides, it's a triangle. There's your proof.

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- #6

SteamKing

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If all interior angles are the same, IPSO FATSO, it's an equilateral triangle.

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Ray Vickson

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What material have you studied so far? All the properties you need are standard, elementary geometry (but, unfortunately, sometimes that is not taught any more).

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