Question

Distance between the centres of two circles touching internally is 10 cm. Ifthe radius of one of the circlesis 15 cm. Find the radius of other circle. ​

Answer 1

Step-by-step explanation:

Find the distance between their centres. Distance between their centres is 25 cm or 5 cm . By theorem of touching circles, the centres and point of contact are collinear .

Answer 2

Step-by-step explanation:

D(distance between there centre )= 10

since the circles r touching internally

d = r1- R2

10= 15-r2

R2=15-10

=5

therefore radius of the second circle is 5