Two spherical balls lie on the ground touching.

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?

Quiz

Answer/Solution

15/2 cm

Steps/Work

similar triangle properties..
2/r+10 = 10/r-10
giving r = 15/2.
Answer: D

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Two spherical balls lie on the ground touching. If one of the balls has a radius of cm, and the point of contact is cm above the ground, what is the radius of the other ball?

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