Dustinsfl
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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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Euclidean Theorem: Triangle Interior Angles Sum to 180°
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AFAIK it doesn't have a name.
Dustinsfl
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Do you know what the theorem states?
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It says pretty much what you said - that the sum of the interior angles of a triangle is 180 degrees.
Dustinsfl
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How could use the theorem to determine the sum of the angles of a convex quadrilateral?
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Try connecting two opposite corners of the quadrilateral with a line
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