Two spherical balls lie on the ground touching. If one of the balls has a radius of 4 cm, and the point of contact is 6 cm above the ground, what is the radius of the other ball?
Pick
A) 10 cm B) 12 cm C) 14 cm D) 16 cm E) 18 cm
similar triangle properties..   2/r+4 = 4/r-4   giving r = 14.   Answer: 14 cm
<result>C</result>
Two spherical balls lie on the ground touching. If one of the balls has a radius of 4 cm, and the point of contact is 6 cm above the ground, what is the radius of the other ball?