Parts of a Circle
Key Terms:
- Radius: The radius of a circle is the distance between its centre and any point on the edge. It is generally denoted as r. A circle has an endless number of radii.
- Diameter: It is a line that runs through the centre and has its ends on the circle. It is denoted as D and is twice the value of the radius of the circle.
- Circumference: The extent of the circle’s border equals its circumference. This signifies that a circle’s perimeter equals its circumference. The circumference of the circle will be equal to the length of the thread that neatly wraps around its perimeter. It is given as 2πr.
Surface Area of Circle Formula
A circle is made up of points that are all at the same distance from the circle’s centre. A closed geometric form is a circle. In everyday life, we see circles in the form of a wheel, pizzas, a round ground, and so on.