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Fig. 15.17, shows a sector of a circle, ...

Fig. 15.17, shows a sector of a circle, centre `O` , containing an angle `thetao` , prove that: (FIGURE) (i) Perimeter of the shaded region is `r\ (tantheta+sectheta+(pitheta)/(180)-1)` (ii) Area of the shaded region is `(r^2)/2\ (tantheta-(pitheta)/(180))`

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