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In the figure below AOC is a diameter of the circle centre O, AB=BC and `angle` ACD=`25^0`, EBF is a tangent to the circle at B. G is the point on the minor arc CD.

(a) Calculate the size
(i) `angle` BAD
(ii) The obtuse `angle` BOD
(iii) `angle` BGD
(b) Show that `angle`ABE=`angle` CBF