The lower left-hand corner angle of the triangle is 85o because it is vertical to an 85o angle.
Since the lines are parallel, the angle supplementary to the lower right-hand corner angle of the
triangle is 98o.
This makes the lower right-hand corner angle of the triangle 180o - 98o = 82o.
Now, we know two of the three angles of the triangle; all we need to do is find the size of the
third angle. 180o - 85o - 82o = .......