The area of a sector of a circle of radius 5 cm formed by an arc of length 3.5 cm is__________?
A. 0.35 cm2
B. 17.5 cm2
C. 8.75 cm2
D. 55 cm2
The area of a sector of a circle of radius 5 cm formed by an arc of length 3.5 cm is__________?