1960 IMO Problem 6

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  • Vinuthan S
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    1960 IMO Problem 6

     

    Consider a cone of revolution with an inscribed sphere tangent to the base of the cone. A cylinder is circumscribed about this sphere so that one of its bases lies in the base of the cone. let $V_1$ be the volume of the cone and $V_2$ be the volume of the cylinder.

    a) Prove that $V_1 \neq V_2$;

    b) Find the smallest number k for which $V_1=kV_2$; for this case, construct the angle subtended by a diameter of the base of the cone at the vertex of the cone.

     

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