The formula for the area of a sector in radians is [tex]A= \frac{1}{2}r^2 \theta [/tex], where theta is the angle in radians. For us, the formula looks like this: [tex]A= \frac{1}{2}(9)^2* \frac{3 \pi }{5} [/tex]. Doing all the multiplication on that gives us [tex]A= \frac{243 \pi }{10} [/tex]. Multiplying in pi and rounding to the nearest tenth gives us an area of 76.3 meters squared. You can use the formula for the area of a sector with the angle in degrees as well. Just replace the 360 degrees with 2pi and it works the exact same way.
