Albert is working a deck in the garden . the deck is in a triangular shape with the length of sides 30m,42m and 33 m work out the perimeter of Albert's deck

ans789

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.