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In the figure given below (not drawn to scale) DC is a tangent to the circle centre O. AOBC is a straight line.
(a) Show that triangle ADC is similar to triangle DBC.
(b) Given that BC=4cm and DC=6cm, calculate:
i).the length of AB.
ii) the size of angle ACD.
![Q541820201027.png](/courses/uploads/Q541820201027.png)