If two circles touch internally,then the distance between the centres of the circles is equal to the sum of their radii.

Two circles touch each other externally. The distance between the centres of the circles is 14 cm and the sum of their areas is 308 cm^(2) . Find the difference between radii of the circles. (in cm)

The lengths of radii of two circles are 5 cm and 3 cm. The two circles touch externally. Then the distance between the centraes of the circles is

Length of radii of two circles are 3.5cm and 2cm. Two circles touch internally. Distance between two centres of the circles is

If two circle of radii 9 cm and 4 cm are touching internally,then the distance between their centres in cm is:

The distance between the centres of the two circles of radii r_1 and r_2 is d. They will thouch each other internally if