Question 27581
THE RADIUS AT THE POINT OF TANGENCY ,THAT IS THE LINE JOINING THE CENTRE TO THE POINT OF TANGENCY IS PERPENDICULAR TO THE TANGENT.HENCE DISTANCE OF CENTRE FROM CENTRE OF A CIRCLE TO THE TANGENT IS THE DISTANCE OF CENTRE OF CIRCLE FROM THE POINT OF TANGENCY IS EQUAL TO THE RADIUS.HENCE THE DISTANCE IS 2 ,THE RADIUS.YOU DONT NEED THE COORDINATES OF CENTRE OR POINT OF TANGENCY OR ANY OTHER DATA TO CALCULATE THIS.YOU ONLY NEED TO KNOW THE RADIUS.