Here we will show you how to calculate the radius, area, and circumference of a circle with a diameter of 10. All answers come with the definition, formula, math, and of course, the answer. We start by displaying an illustration of a color-coded circle with a diameter of 10.

The diameter is shown in green in our illustration above. The diameter is the straight line distance through the center from one side of the circle to the other side. Our diameter is 10. For our calculations, it could be a diameter of 10 inches, a diameter of 10 feet, a diameter of 10 cm, or any other unit of measurement.

Radius of a circle with a diameter of 10

The radius is shown in red in our illustration above. The radius is the straight line distance from the center of the circle to the edge of the circle. Thus, it is half the size of the diameter. Here is the formula, the math, and the answer to calculate the radius of a circle with a diameter of 10:

10 ÷ 2 = 5

Area of a circle with a diameter of 10

The area is colored in orange in our illustration above. To calculate the area of a circle, you multiply Pi (π) by radius squared. Below is the formula, the math, and the answer to calculate the area of a circle with a diameter of 10:

π × 52 ≈ 78.54

Circumference of a circle with a diameter of 10

The circumference is shown in black in our illustration above. The circumference is the perimeter of a circle. In other words, the circumference is the length of the arc or edge of the circle. To calculate the circumference of a circle, you multiply 2 by Pi (π) by radius. Below is the formula, the math, and the answer to calculate the circumference of a circle with a diameter of 10:

2 × π × Radius = Circumference

2 × π × 5 ≈ 31.42

Note that Pi (π) is an irrational number that starts with 3.14 and goes on indefinitely. For all our calculations, we used Pi with eight decimal places (3.14159265), and then we rounded to the nearest hundredth.

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Circle with a diameter of 11

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