The ratio of the length to breadth of a room is 7:5. Find the length
of the room if the breadth is
10m

14m

Explanation:

10 ÷ 5 = 2

2 × 7 = 14

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.