A,B and C are three points on a circle with centre O such that angle BOC =30°and abgle AOB=50°. if D is a point on the circle other than the arc, find angle ADC.
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If angle AOB=50°
angle BOC=30°
therefore, angle AOB+angle BOC=angle ADC
=50+30=80
therefore, angle ADC=1/2×80
=40
angle BOC=30°
therefore, angle AOB+angle BOC=angle ADC
=50+30=80
therefore, angle ADC=1/2×80
=40
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