Advanced Geometry by H.C. Rajpoot-2014

Geometry Level pending

A right circular cone, with apex angle 2α=60 degree, is thoroughly cut by a smooth plane inclined at an angle θ=70 degree with the axis OO’ & at a normal distance OM=20cm from the apex point 'O'. Find out the area of curved surface (in sq. cm.) of the frustum (as shown in the figure above).

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