Area of sector JFK=70degree JD=7cm

A sector is some portion of a circle.

Formula for area of a circle is A =(pi)r

^{2}For the area of some sector with x degrees lets use a proportional relationship

Area

_{sector}x degrees____________ = _____________

Area

_{circle }360 degrees(AREAsector) =
70

(pi) r

^{2}360Solve by cross multiplication.