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when you add two or more numbers together, the result is called the sum
a link between two or more things; a plane or line
They are coplanar if the line joining any two of them intersects the line joining the other two.
Polygons are closed, two-dimensional figures that have 3 or more sides.
Place a measuring ruler or tape alongside the line. Read of the graduation marks which are next to the two points. Subtract the smaller from the larger and the result will be the length of the line segment.