P & Q are centres of circles of radii 9 cm and 2cm respectively. PQ = 17 cm. R is the centre of the circle of radius x cm which touches the above externally. Given that angle, PRQ is 90. Write an equation in x and solve it.

P and Q are centres of circles of radii 9 cm and 2 cm respectively. PQ = 17 cm. R is the centre of a circle of radius x cm which touches the above circles externally. Given that anglePRQ = 90^@ , write an equation in x and solve it.

X and Y are centres of circles of a radii 9 cm and 2 cm respectively, XY = 17 cm. Z is the centre of a circle of radius r cm which touches of above circles externally. Given that angle XZY = 90^(@) , the value of r is

P and Q are centres of two circles with radii 9 cm and 2 cm respectively, where PQ = 17 cm, R is the centre of another circle of radius x cm which touches each of the above two circles externally. If angle PRQ = 90^(@) , then the value of x is -

Two circles of radii 5 cm and 3 cm touch externally. Find the distance between their centres.

Two circles of radii 7 cm and 4 cm touch each other externally. Then the distance between their centres.

If two circles with radii 5 cm and 3 cm respectively touch internally, find the distance between their centres.

A and B are the centers of two circles with radii 11 cm and 6 cm respectively. A common tangent touches these circles at P and Q respectively. If AB = 13 cm, then the length of PQ is: