In the following figure, the radii of the largest and smallest circles are 20 and 5. Find the radius of the intermediate circle.
Solution: The fig can be considered as:
Since the triangles are similar:
r1+r2r2+r3=r1−r2r2−r3Substituting r1= 20 and r3= 5 , r2 = 10. Option (b).
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