you are constructing a tangent line from a point outside a given circle to the circle is to draw a circle and a point outside the circle. in order to do this, what construction must you know how to do?
a. copy a segment
b. draw a perpendicular bisector
c. draw an angle bisector
d. copy an angle

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.