Question

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

Answer 1

Answer:

Correct option is

C

8 cm

From the given figure, CD = 4 cm

CD=AD=4 (tangents drawn from an exterior point are equal)

CD=BD=4 (tangents drawn from an exterior point are equal)

Now, AB=AD+BD=4+4=8 cm.