Ways & How

how to calculate the area of a circle

how to calculate the area of a circle

If you need to know how to calculate the area of a circle, don’t freak out. It’s no big deal. Calculating the area of a circle isn’t all that difficult. This is how to figure it out.

  1. First, you need the formula for calculating the area of a circle: A = ?r2. So the area equals ? or pi multiplied by the radius squared. To help you remember the formula, remember that a pie is round.

  2. So what exactly do all the terms mean? Area is basically the amount of space something occupies. Pi is a specific irrational number, meaning it never ends. Usually, for most calculations, you can shorten pi to just 3.14, but many calculators let you use the pi symbol ? for a more accurate answer. The radius is the distance in a straight line from the exact center of the circle to its outer edge. Squared means you multiply the radius by itself.

  3. Let’s start with a simple example. Let’s say that you know that the radius is 3 inches.



    that number in the equation to get the area. 3 squared or 3 times 3 is 9. Next, multiply 9 by the value of ? to get an area of 28.26 inches2.

  4. Now, let’s say your older brother comes in and challenges you to measure the area of a round pizza that’s sitting on your dining room table before he lets you have some. The monster doesn’t even tell you the pie’s radius. But you’re the genius and won’t let him stump you. So take out a ruler and measure from the exact center to the outer edge to get the radius. So if the pizza is 8 inches in radius, then you can figure out the area. A = 3.14 x 8 x 8 = 200.96 inches2.

So you see that learning how to calculate the area of a circle is actually very simple. It doesn’t take much skill or thought. You just need to find the radius to get the area.

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