Which of the following represents the correct formula for calculating the amount of fabric needed to make a curtain?

A. length x width) + seam allowance
B. (length x seam allowance) + width
C. (length + seam allowance) x (width + seam allowance)
D.(seam allowance x 2) + (length x width)

2 answers

None of those choices mentions hems and top treatment (rod pocket, etc.) Therefore, none of these answers is correct.
Which of the following represents the correct formula for calculating the amount of fabric needed to make a curtain?
Answer: (length + seam allowance) x (width + seam allowance)