Question

the perimeter of the shape is 309 inches. what is the missing side length? 70 inches 71 inches 72 inches 69 inches 71 in. 56 in. 48 in. 64 in.

Explanation:

Step1: Sum known side lengths

$48 + 71+56 + 64=239$

Step2: Find missing side length

Let the missing side length be $x$. The perimeter $P$ of a polygon is the sum of all side - lengths. So $P=239 + x$. Given $P = 309$, we have $x=309 - 239$.
$309-239 = 70$

Answer:

70 inches