Question

In Fig. 9, is shown a sector OAP of a circle with centre O, containing ∠ϴ. AB is perpendicular the radius OA and meets OP produced at B. Prove that the perimeter of shaded region is r $[tan\theta +sec\theta+\frac{\pi\theta }{180} -1]$

Answer 1

hope its helpful and guess u know the diagram