Question

X and y are centres of circles of radii 9 cm and 2 cm respectively, xy = 17 cm. z is the centre of a circle of radius r cm which touches the above circles externally. given that = 90 , the value of r

Answer 1

if the 3rd circle lies between the other 2 circles then ...as xy=17.....9+2=11and the diameter of circle with center z will be 6 cm...
hence radius must be 3 cm.....