This problem asks whether a given set of points is convex or not. A set of points is convex if, for any two points in the set, the line segment connecting them lies entirely within the set.

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Nov 13
This theorem states that a triangle is isosceles if and only if the sum of the squares of its two shorter sides is equal to the square of its longest side.

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Nov 12
The sum of the interior angles of a polygon with n sides is (n-2)*180 degrees.

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Nov 12