Three circles with centres A,B,C respectively, touch each other externally. If AB=5 cm, BC=7 and CA=6 cm, then the radius of the circle with centre A is:

In the adjoinig figure, three circles with centres A,B,C touch one another extenally. If AB=5 cm, BC =7 can and CA = 6 cm, then length of radius of circle with centre A.

AB and AC are two such chords of the circle with centre at O that each is perpendicular..., r to the other. If AB=4 cm and AC=3 cm, then find the radiu of the circle.

Two circles with radii a and b respectively touch each other externally . Let c be the radius of a circle that touches these two circles as well as a common tangent to the circles. Then

Two circles having radii 3 . 5 cm and 4 . 8 cm touch each other internally . Find the distance between their centres . Given : (i) Two circles with centres A and B touch each other internally at point P . (ii) Radius of circle with centre A is 4 . 8 cm . (iii) Radius of circle with center B is 3 . 5 cm . To Find : AB

Two circles of radii 8 cm and 2 cm respectively touch each other externally at the point A. PQ is the direct common tangent of these two circles of centres O_(1) and O_(2) respectively. The length of PQ is equal to :

Three circles touch each other externally. The distance between their centre is 3 cm, 4 cm and 5 cm. Find the radii of the circles :

Two circle having radii 5 . 5 cm, 4 . 2 touch each other externally . Find distance between their centres ? Given : (i) Two circles with centres P and Q touch each other extaranlly at point R . (ii) Radius of circle with centre P is 5 . 5 cm (iii) Radius of circle with centre Q is 4 . 2 cm