1. Check it out! 1 3.4.2: Deriving the Formula for the Area of a Sector

2. A new, decorative stained-glass window is in the shape of a semicircle with a 2-foot diameter. The window is to be covered with fabric and outlined with ribbon until an unveiling ceremony. 1.How many feet of ribbon will be needed if you need 2 extra feet of ribbon to tie a bow? 2.How many square feet of fabric will be needed? 2 3.4.2: Deriving the Formula for the Area of a Sector

3. 1.How many feet of ribbon will be needed if you need 2 extra feet of ribbon to tie a bow? Find the perimeter of the window and add 2 feet for the bow. You will need at least 5 feet 2 inches of ribbon to make sure there is enough ribbon for the bow. 3 3.4.2: Deriving the Formula for the Area of a Sector

4. 2.How many square feet of fabric will be needed? Find the area of the window. Approximately 1.57 square feet of fabric will be needed. 4 3.4.2: Deriving the Formula for the Area of a Sector