Finding the centre
-First of all, we drew two tangents that are not directly opposite each other. Since tangents and radii form 90 degree angles, we can find the diameter of the circle. From there we can either split the diameter into two or find the intersection of the lines perpendicular to the tangent.
Finding the radius
-We measure the diameter and split it into half. (In this case the circle we constructed had a radius of 6 cm