What is a broken line and a perimeter?
A broken line (polygonal chain) is made of segments (links) joined at angles. Vertices are the points where links meet. A closed broken line forms a polygon. The perimeter is the sum of the lengths of all sides of the polygon (or all links of the chain).
A broken line is several segments joined at angles
Vertices are the points where each link starts or ends
A closed broken line = a polygon
Perimeter — P=a+b+c+⋯ (sum of all side lengths)
Vertices and links on the drawing
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