- #1

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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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- #1

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- #2

Mentor

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AFAIK it doesn't have a name.

- #3

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Do you know what the theorem states?

- #4

Mentor

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- #5

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

- #6

Staff Emeritus

Science Advisor

Gold Member

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Try connecting two opposite corners of the quadrilateral with a line

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