As stated the area of the circle is 85π ft2. The area of the sector BAC is a portion of this full circle area. the sector is made of 2 radii and arc that has rotated by 36°. the magnitude of the central angle in the circle is 360° Area for 360° central angle - 85π ft2 then the area for 1° = 85π ft2/360° the area of 36° sector = 85π ft2/360° x 36° = 8.5π ft2
