How to draw a Circle of a Given Radius – Using Compass

Circle

A circle is a collection of all the points in a plane, whose all points are same distance from a fix point. The fix point is called center of the circle. 

We use instruments for drawing a circle, on a paper whose radius is given is known as the compass and ruler. 

Before we learn how to draw a circle, we see some properties of a circle.

Diameter 

The longest distance that has the end points on the circle and passes through the center is known as diameter. 

Radius 

The distance from center of a circle to any point on the circle, is known as radius. It is half of the diameter.
Given that the radius of the circle is 5 cm, then the steps for draw the circle are as follows.

Step 1: Mark a point O on a sheet of paper, This point is supposed to be the center (O) of the circle, where we construct the circle. Hence a circle can be drawn if its center and radius are known.

                                    Point O

Step 2: Radius is 5 cm, we measure 5 cm using scale and compass.

Step 3: Place the pointer of the compass at the point O. 
Without disturbing turn the compass slowly, holding 
the compass from its knob, draw a complete arc, after completing one complete round we get the desired circle O.