O is the centre of a circle and ab is a diameter if angle EOF is equal to 40 degree find angle EDF
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Step-by-step explanation:
We have,
AB as the diameter of circle,
now,we have given that angle COB=40°
So,therefore ,by the theorem , The angle subtended by the arc at the centre is double the angle subtended by the arc at any point on the circle.
so,we get,
angle COB=2angle CAB
40°=2 angleCAB
40°/2=angleCAB
20°=AngleCAB
we get angle CAB is equal to 20°
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