[b]Check boxes for the following:[/b][br]1. Hint for (a): Properties of circle.[br]2. Hint for (b): What is this special triangle?[br][br][b]Blue dots for :[/b][br]1. Moving the point Z and the centre 0.[br][br][b]Question:[/b][br]ZW and ZX are tangents to a circle centre 0 and radius x. Given that ZW = 12 units and CZ = 8 units,[br][br](a) find the expression of OZ in terms of x,[br](b) calculate the value of x,[br][br](c) find the area of quadrilateral OXZW,[br](d) find the area of the shared region.