3.1 O is the centre of the circle with radius r, and chord AB = √128 cm. OCD 1 AB and OC: CD = 3:2. ABD = 27°. A C 27 B D 3.1.1 Calculate the length of the radius of the circle. (leave your answer in simplest 3.1.2 surd form) Calculate, with reason AÔD. (5) (2)
