Suppose f f, g g, h h, and j j are functions such that: f ( r ) f(r) represents the circumference (in cm) of a circle whose radius is r r cm. g ( c ) g(c) represents the radius (in cm) of a circle whose circumference is c c cm. h ( r ) h(r) represents the area (in cm2) of a circle whose radius is r r cm. j ( a ) j(a) represents the radius (in cm) of a circle whose area is a a cm2. use function notation to represent the area of a circle whose circumference is 117 cm.