For this case we have:
The area of the piece of fabric is given by 
Where


Substituting in the formula of the area we have:




Thus, the area of the piece of fabric is given by: 
Answer:

The model hight for the door will be 27 centimeters
Measure the sides. And when you get all of the sides add them I'll and get the perimeter I think.
an arc of a circle having measure less than or equal
I don’t really know if this is a question but if ur asking the variable of an unknown number then it’s x??