Two spherical balls lie on the ground touching. If one of the balls has a radius of 10 cm, and the point of contact is 12 cm above the ground, what is the radius of the other ball?
Select the correct option.
A) 2 cm
B) 5/2 cm
C) 5 cm
D) 15/2 cm
E) none of the these
similar triangle properties..   2/r+10 = 10/r-10   giving r = 15/2.   Answer: 15/2 cm
<result>D</result>
Two spherical balls lie on the ground touching. If one of the balls has a radius of 10 cm, and the point of contact is 12 cm above the ground, what is the radius of the other ball?