The diagram shows triangle ABC in which AB is perpendicular to BC. The length of AB is 4cm and angle CAB is (I radians. The are DE with centre A and radius 2 cm meets A C at D and AB at E. Find, in terms of or, i the area of the shaded region, [3] ii the perimeter of the shaded region. [3] Cambridge International AS & A Level Mathematics 970.9 Paper 11 Q6 June 2014