Its called a line graph
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it has to be made out of strait lines so no curves and it has to be closed last it has to be flat it cant be 3D
A graph made up of small dots connected by a line is called a line graph. Line graphs are normally used to see the gradual change of something over time. For example, in the stock market line graphs are used all the time to show how our industries are gaining or losing money.
It is the total length of its boundary. There is no need for the boundary to be made up of straight lines or even smooth curves. However, fractals do cause problems.
Scatter Graph
because the Vikings didn't have pencils or pens like our day's they had to write using knives and stcks making it hard to draw curves so they made the alphabet up of mainly straight lines so they could write them