What is the name of a line that meets a circle in exactly one point?
If two circle intersect at two points, how many common tangents do they have?
If I draw two tangent segments from a point outside the circle, are they equal in length?
If two circles lie outside each other, how many common tangents do they have?
If I draw two tangents to a circle, one from each end of a diameter, are the tangents parallel?