Final answer:
To determine how much lace Darma needs for the tablecloth, we calculate the perimeter by adding twice the length and twice the width. With a tablecloth measuring 210 cm by 180 cm, Darma needs 780 cm of lace.
Step-by-step explanation:
To calculate the amount of lace Darma needs to edge a tablecloth, we must determine the perimeter of the tablecloth. The tablecloth has dimensions of 210 cm by 180 cm. To find the perimeter, we add together the lengths of all four sides.
The formula to calculate the perimeter is:
Perimeter = 2 × (length + width).
Applying this formula, we have:
Perimeter = 2 × (210 cm + 180 cm)Perimeter = 2 × 390 cmPerimeter = 780 cm
Therefore, Darma will need 780 cm of lace to edge the entire tablecloth.