The length of the rectangular classroom is 8 m. Find the perimeter of the class if its area is 16m2.

From the condition of the problem, we know that the length of the classroom, let us denote it by a, is equal to a = 8 meters, and its area S = 16 sq. M. We know that to find the area of a rectangle there is a formula:
S = a * b
From this formula, we can find the width b of a given room:
b = S / a = 16/8 = 2 meters.
By knowing the length and width of the classroom, we can find its perimeter. There is also a formula to find the perimeter of a rectangle:
P = 2 * (a * b) = {substitute our length and width into it and get} = 2 * (8 + 2) = 2 * 10 = 20 meters
Answer: P = 20 meters