Find the perimeter of complex figures quiz. Featuring in this quiz are figures in L-shaped forms having sides of different lengths. To find the perimeter, values of missing sides have to be found. The perimeter is the distance right round a shape. All sides will the added and the sum is the perimeter of the figure. This activity can be used to calculate surface areas of different surfaces in real life. Some examples include apartment sizes, football field sizes, and more. This geometry activity is for students in 4th, 5th, 6th, and 7th grade.