9709 P12 - Mar 2025 - Q4 - 6 marks
9743
Triangle \(OAB\) has \(OA=OB=10\text{ cm}\), \(\angle AOB=0.8\) radians. Points \(C,D\) lie on \(OA,OB\), with \(OC=OD=6\text{ cm}\); arc \(CD\) has centre \(O\). The shaded region is bounded by \(CD,CA,AB,BD\).
(a) Find its perimeter. [3]
(b) Find its area. [3]
