A frustum is obtained by removing a cone of height 6 cm from a similar cone of height 18 cm. If the radius of the original cone is 9 cm, find the radius of the removed cone in cm.
Physics · Mathematical tools and vector · Geometry & Mensuration
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Question

A frustum is obtained by removing a cone of height 6 cm from a similar cone of height 18 cm. If the radius of the original cone is 9 cm, find the radius of the removed cone in cm.

G1 Physics · Accepted Answer

By similarity, r/9=6/18=1/3, hence r=3 cm.