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Assume each side is a straight line segment.

With 3 sides you can make 1 triangle with a sum of interior angles = 180°.

With 4 sides you can make 2 triangles with a sum of interior angles = 2 x 180° = 360°.

With 5 sides you can make 3 triangles with a sum of interior angles = 3 x 180° = 540°.

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โˆ™ 2010-10-23 12:02:56
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