XOY is a real sector of a circle center O of ra... - WAEC Mathematics 2005 Question
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 option: c
Area of a sector \(=\frac{\theta}{360}\times \pi r^2\
\left(\frac{144}{360}\times \pi \times \frac{3.5}{1} \times 3.5\right)cm^2 = 4.9\pi cm^2\)
\left(\frac{144}{360}\times \pi \times \frac{3.5}{1} \times 3.5\right)cm^2 = 4.9\pi cm^2\)
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