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What is the famous theorem in Euclidean geometry that states that the sum of the interior angles of a triangle is 180 degrees?

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- Thread starter Dustinsfl
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Mark44

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AFAIK it doesn't have a name.

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Do you know what the theorem states?

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Mark44

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How could use the theorem to determine the sum of the angles of a convex quadrilateral?

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Office_Shredder

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Try connecting two opposite corners of the quadrilateral with a line

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