Area of sector JFK=70degree JD=7cm
A sector is some portion of a circle.
Formula for area of a circle is A =(pi)r2
For the area of some sector with x degrees lets use a proportional relationship
Areasector x degrees
____________ = _____________
Areacircle 360 degrees
(AREAsector) = 70
(pi) r2 360
Solve by cross multiplication.