Ihave many questions i don't know which one i should push the first

Ok.

Step-by-step explanation: Just choose a question that you don't know and try to solve it.

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.

for future students the answer is b

hope i

-lavira: )