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a "circle graph" is also a polar graph, it's used to graph polar coordinates.
how are emeralds use in everyday life
If cartesian coordinates are used then the second number in an ordered pair is the y coordinate, also known as the ordinate. If polar coordinates are used then the second number is the angle.
Unless your "everyday life" involves work in some area of engineering, you won't use matrices in your everyday life.
Geometry is used in my everyday life because I see it everyday. Everything I see is practically geometry. There are posters on my classroom wall, there are desks and chairs, tables, and a big nice white board. I guess this is really how I used geometry in my everyday life.