A couple of shapes that have perpendicular lines are right triangles, and rectangles.
The answer is 12 divide 168 by 14 to get 12.
Find a common denominator or the bottom number of a fraction. 5 and 5/6 - 11/6 - 4/6 - 3/4 = 140/24 - 44/24 - 16/24 - 18/24 = 96/24 - 16/24 - 18/24=62/24 or 2 and 7/12.