Given:
diameter of semi-circle = 12 ft
The number of feet needed to complete the project is the perimeter of the carpet as shown in the diagram.
We need to find the circumference of the semi-circle and then sum up the lengths.
The perimeter of a semi-circle can be found using the formula:
where r is the radius of the semi-circle and
d is the diameter of the semi-circle.
The perimeter of the semicircle is:
The total perimeter would be:
Hence, Sandy would need 45 ft of wood trim for the project.
Answer:
45