Question

O is the centre of a circle and ab is a diameter if angle EOF is equal to 40 degree find angle EDF ​

Answer 1

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°