Welcome! In this calculation, we will use the radius of a circle to find its diameter, area, and circumference. This calculation is a great way to get a better understanding of circles, as well as to practice using the radius to calculate other properties of the circle. Let's begin!


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Diameter refers to a straight line that reaches from one point on the edge of a round shape or object, through its centre, to a point on the opposite edge.
Similar to the term 'perimeter' of polygons, circumference is the linear distance of a circle's edge. However, the term perimeter is not used for circles.
The diameter of a circle is calculated by doubling the radius:

The circumference of a circle is calculated using the formula:

The area of a circle is calculated using the formula:

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