The measure of the side length of AC will be 13 inches
What is the perimeter of a triangle?
Let the triangle be ABC. Then the perimeter of the triangle will be
Perimeter = AB + BC + CA
Triangle ABC has a perimeter of 40 inches.
The side's lengths are given as AB = 12 inches and BC = 15 inches.
Then the measure of the side length of AC will be
40 = 12 + 15 + AC
40 = 27 + AC
AC = 13 inches
The missing diagram is given below.
More about the perimeter of a triangle link is given below.
https://brainly.com/question/23935199
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