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Surface Areas And Volumes

Question 5:

A metallic right circular cone 20 cm high and whose vertical angle is 60° is cut into two parts at the middle of its height by a plane parallel to its base. If the frustum so obtained is drawn into a wire of diameter cm, find the length of the wire.

Answer:

In ΔAEG,

In ΔABD,

Radius (r1) of upper end of frustum = cm

Radius (r2) of lower end of contai...

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