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Diagonals of Polygons

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Explanations 1

A diagonal of a polygon is a segment that connects any two vertices of the polygon that are not consecutive. So, a square has 2 diagonals, a triangle has 0, etc. If a polygon ha…
By Vincent Huang

Problems 1

Each pair of vertices of a regular 10-sided polygon is connected by a line segment. How many unordered pairs of distinct parallel line segments can be chosen from these segments…