The invention of the wheel-cart was one of the transforming events in early human history. cylinders, tubes, gears, and others are used by engineers for making clocks, bikes, cars, trains, ships, planes, and even rockets. Practical applicationĬircles are often used by architects for athletic tracks, recreational areas, buildings, and roundabouts. The circumference is therefore 2 x 3.14159 x 8 = 50.26 feet. For example, if the diameter is 16 feet, then the radius is 16 / 2 = 8 feet. If the diameter is given instead, first divide it by two, then repeat the above process. For example, the circumference of a circle with a radius of 4 inches is simply 2 x 3.14159 x 4 = 25.13 inches. If the radius is given, applying the formula is straightforward.
One needs to know just the radius or the diameter of a circle in order to calculate its circumference. If by moving the measurement instrument slightly you get a bigger diameter size, then go with that.Įxample: find the circumference of a circle To make sure you are measuring the diameter correctly, it should be the biggest measurement you can get.
#RADIUS OF A CIRCLE HOW TO#
How to calculate the circumference of a circle?Ĭalculation is easy once you have measured the circle's radius or diameter, using the formulas above or, if you prefer the easier way - using our circumference of a circle calculator above. The calculation result is in the unit in which you measured the circle radius or diameter. If you know the diameter, it is 2 times the radius, so just divide by two, to get the radius, or use this formula: π x diameter. In practical situations it is often easier to measure the diameter instead of the radius. It was originally defined as the ratio of a circle's circumference to its diameter (see second formula below on why) and appears in many formulas in mathematics, physics, and everyday life. The circumference of a circle is calculated using the formula: 2 x π x radius, where π is a mathematical constant, equal to about 3.14159. Example: find the circumference of a circle.How to calculate the circumference of a circle?.
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