Solution:

Let’s draw a tangent

to the circles given.

As

is the tangent and

is the chord, we have

[Angles in alternate segment]

Similarly,

Now, subtracting (i) from (ii) we have

But in

Ext.

Or,

Thus,

Solution:

Let’s draw a tangent

to the circles given.

As

is the tangent and

is the chord, we have

[Angles in alternate segment]

Similarly,

Now, subtracting (i) from (ii) we have

But in

Ext.

Or,

Thus,