A, B and C are points on a circle.
EF is a tangent to the circle at C.
D is a point on AC.
Angle CBD:Angle ABD = 3:1.
Find angle ADB.
Give a geometrical reason for each step of your working.

A B and C are points on a circle EF is a tangent to the circle at C D is a point on AC Angle CBDAngle ABD 31 Find angle ADB Give a geometrical reason for each s class=