Question

AB and CD are two common tangents to the circles to which touch each other at a point C. If D lies on AB such that CD = 4cm then AB is
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Answer 1

Step-by-step explanation:

If you draw two tangents from an outside point , they are equal in length.

In the first circle, we can say that AD and CD are two tangents drawn from an outside point D .

This implies: AD=DC

DC=4 cm = AD ............(1)

Similarly, for tge second circle , two tangents are DB and DC.

DC=DB= 4cm ...............(2)

Now AB = AD+DB

By (1) & (2)

AB =8 cm

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