Question

Two circles of radii 4 cm and 1 cm touch each other externally and x
is the angle contained by their direct common tangents, find sin x/2 + cos x/2​

Answer 1

Answer:

Step-by-step explanation:

BD||C1C2

BC2=C1D

so AD= 14-1= 3cm

In this way BD= 5cm

In same way AB= 4

now put the value in eqn

3/5+4/5=  7/5