1.

Five spheres are kept in a cone in such a way that each sphere touch each other andalso touch the lateral surface of the cone, this is due to increasing radiusof the spheres starting from the vertex of the cone . The radius of the smallest sphere is 16 cm. If the radius of the fifth ( i.e, largest ) sphere be 81 cm, then find the radius of the third ( i.e, middlemost) sphere :

Answer»

A. 25 cm
B. `25 sqrt(3) cm `
C. `36 cm `
D. data INSUFFICIENT .

ANSWER :C


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