Car makers - measure car wheels to make sure they fit
Race engineers - Use it to find out what size tire gives them the most performance
Bakers - Use it to make pies and other circular stuff
Military engineers - Balancing helicopter blades
Aircraft engineer - Propeller efficiency
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(C = 4 x 2 x 3.14): Circumference = 25.12
You use fractions for LOTS of things in the real world like money, gambling, shopping, clothing, etc.
If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi
December 3rd, 2029!
A circumference is just a length, it can be in meters, feet, yards, or whatever unit you use to measure or calculate it.