Find the surface are of the sphere r=13

2123.71663 or you can round to 2123.72

Step-by-step explanation:

4 times Pi times the radius squared =

4xπx169

what?

step-by-step explanation:

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.