Given:  Concentric circles with center

Exercises 16, 17 
Find: 


(HINT: Let

To calculate:
The value of
Given:
The concentric circles with centre
Postulate used:
A radius that is perpendicular to a chord bisects the chord.
Concentric circle:
Concentric circle are coplanar circles that have a common centre.
Since, a radius is a line segment that joins the centre of the circle to a point on a circle.
Calculation:
Let,
Since,
Now,
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