XOY is a real sector of a circle center O of radius 3.5cm which subtends an angle of 144o at the center. Calculate, in term of ϖ, the area of the sector
-
A.
1.4ϖcm2 -
B.
2.8ϖcm2 -
C.
4.9ϖcm2 -
D.
9.8ϖcm2
Correct Answer: Option C
Explanation
Area of a sector (=frac{theta}{360}times pi r^2\
left(frac{144}{360}times pi times frac{3.5}{1} times 3.5right)cm^2 = 4.9pi cm^2)