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:
Answer & explanation
Correct answer: option 4
We know that,
Distance between centres = Radius of 1st circle + Radius of 2nd circle
Distance between their centres = 8 cm
Radius of 1st circle = 3 cm
Let the radius of second circle = x
According to the question,
= 8 = 3 + x
= x = 8 – 3 = 5 cm