Answer:
18 pi cm^2
18 (3.14) =56.52 cm^2
or use the pi button 56.54866776 cm^2
Explanation:
First find the area of the entire circle
A = pi r^2
A = pi 9^2
A = 81 pi
The area of a circle is 360 degrees. The shaded area is 80 degrees
Take the fraction of the circle that is shaded and multiply by the total area
80/360 * 81 pi
2/9 * 81 pi
18 pi
We can approximate pi
18 (3.14) =56.52
or use the pi button
56.54866776