Answer :
The dimensions of a rectangle are 19m.
Here we have to find the dimensions of a rectangle.
Data given:
Perimeter = 76m
The formula for the perimeter of the rectangle:
perimeter = 2( length + breadth)
So,
76 = 2 ( l+b)
l + b = 38
l = 38 -b
The formula for the area of the rectangle:
Area = length × breadth
A =( 38-b)×b
= 38b - b²
At maximum point:
dA/ dw = 38 - 2b
38 - 2b = 0
b = 19
Therefore the dimension is 19m.
To know more about the rectangle refer to the link given below:
https://brainly.com/question/25292087
#SPJ4