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The height and radius of the cone of t...

The height and radius of the cone of the cone of which the frustum is a part are , `h_(1) and r_(1)` respectively . If `h_(2) and r_(2)` are the height and radius of the smaller base of the frustum respectively and `h_(2) : h_(1) is 1 : 2 ` determine `r_(2) : r_(1)`

A

`1 : 3 `

B

` 1 : 4`

C

` 2 : 1 `

D

`1 : 2 `

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