Question

the perimeter of the figure below is 122.3 ft. find the length of the missing side. 41.6 ft 7.3 ft 7.3 ft 13 ft 20.8 ft 13 ft 13 ft? (note: diagram is not to scale)

Explanation:

Step1: Sum known side - lengths

$7.3 + 41.6+7.3 + 20.8+13+13+13=126$

Step2: Find the missing side

Let the missing side be $x$. The perimeter $P$ of the figure is the sum of all side - lengths. So $P=122.3 = 126 - x$. Then $x=126 - 122.3$.
$x = 3.7$

Answer:

$3.7$ ft