Know More About : Limit Of Composite Function According to the definition of unit circle the radius of unit circle is ‘1’ only, So first we have to see the radius of circle is ‘1’. Step 1: To make a Unit Circle we have to remember some things that is: First it is necessary to take the radius of a circle is ‘1’ because if the radius of circle is more than or less than ‘1’ than the circle is not unit circle. Construction steps of a Unit Circle are mention below: Unit Circles