15 cm 15cm C C 15 cm 123 15 cm p3 cm 9 cm 9 ca In the diagram the lengths of AB and AC are both 15 cm The point P is the foot of the perpendicular from C to AB The length CP 9 cm An are of a circle with centre B passes through C and meets AB at Q a Show that angle ABC 1 25 radians correct to 3 significant figures AP 15 9 2 AP IMY 1 2 cm 121