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Well, in math you solve the perimeter of circles and such, and learn understanding of them to help you with circles in real life.
circles are used to set bases of cylinders, diameters for barrels, tires, ect... if you CAN'T think of anything else a circle is used for, think HARDER and there is no real use for trapezoids accept in architecture and other design methods. :)
finding the measurement of a port hole on a ship
circles are used for the area of pools tables desk or any ferniture.they are also used for making products such as a cutout to look off of.
Proportions are used in real life to determine prices of things.