Question

Find the area of the sector cut off by the arc
radius=12cm
length=10.5​

Answer 1

area of sector formula without the central angle = r²×Co$s^{-1}$(r - l)/r

   = 12²×Co$s^{-1}$(12-10.5)/12

   = 144×Co$s^{-1}$(1.5)/12

   = 144×Co$s^{-1}$(1/8)

   = 144×0.15

   = 21.6 cm²