The formula for finding the area of a sector of a circle is a=π r 2 ( x 360 ) a=πr2(x360) , where r is the radius of the circle and x is the measure of the central angle of the sector. solve for x.   x= aπ r 2 360 x= a 360π r 2 x= 360π r 2 a x= 360a π r