the kellys are planning their vacation activities. The first day they can go to the zoo or the museum. The second day they can go the peir or the dunes. The third day they have to choose sailing, swimming or horseback riding

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.

add a picture or measurements so i cab