Question

AB and CD are two common tangents to circle which
touch each other at a point C. If D lies AB such
that CD = 4 cm then AB is
(a) 12 cm
(b) 8 CIM
(c) 4 cm
(d) 6 cm​

Answer 1

Answer:

CD is a common tangent to the two circles at the point of contact. AB is a common tangent to the 2 circles, and D lies on AB such that CD = 4 cm. DA = DC being tangents of circle with centre O and = 4 cm. Again, DB = DC being tangents of circle with centre O and = 4 cm