Given
To find:
The value of a.
Explanation:
It is given that,
That implies,
Since
Alternate segment Theorem states that,
The angle between a tangent and a chord is equal to the angle in the alternate segment.
Then,
[tex]\alpha=\theta[/tex]
Therefore,
[tex]a=40\degree[/tex]
Hence, the value of a is 40°.
