How did architecture change during the Middle Ages?
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The formula for the area of a sector in radians is 
, where theta is the angle in radians. For us, the formula looks like this: 
. Doing all the multiplication on that gives us 
. 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.