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 1.4Ï–cm2
  • B 2.8Ï–cm2
  • C 4.9Ï–cm2
  • D 9.8Ï–cm2
waec 2005mathematics

The correct answer is C. 4.9Ï–cm2

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\)

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