Two circles touch each other externally. The distance between their centres is 8 cm. If the radius of one circle is 3 cm, then the radius of the other circle is:

5 cm

We know that,

Distance between centres = Radius of 1^st circle + Radius of 2^nd circle

Distance between their centres = 8 cm

Radius of 1^st circle = 3 cm

Let the radius of second circle = x

According to the question,

= 8 = 3 + x

= x = 8 – 3 = 5 cm