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. :)
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Try designing a car without one!
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.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.
If you are in school and are studying trig then you are using trig in real life.