A 20-inch pizza is cut into 9 equally sized pieces. How many radians does each slice represent? What is the 'sector area' of each slice?
9 slices means 1/9 of a circle per slice.
So, how many radians in a circle?
a sector's area is a = 1/2 r^2 θ
So, how many radians in a circle?
a sector's area is a = 1/2 r^2 θ