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Re: If the radius of a circle is tripled, what is the ratio of the area of [#permalink]
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Re: If the radius of a circle is tripled, what is the ratio of the area of [#permalink]
thanks for clarifying, the answer still shows 1/18 so I was confused....
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Re: If the radius of a circle is tripled, what is the ratio of the area of [#permalink]
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steveharvi wrote:
thanks for clarifying, the answer still shows 1/18 so I was confused....


The question asks what the ratio of HALF of the original circle is to the WHOLE new circle.
If the radius of the original circle is 2, then HALF of the area would be 2pi.
The WHOLE area of the new circle is 36pi.
2pi / 36 pi = 1/18
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Re: If the radius of a circle is tripled, what is the ratio of the area of [#permalink]
If it weren't half the area, would the answer be 1/9?
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Re: If the radius of a circle is tripled, what is the ratio of the area of [#permalink]
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dannythor6911 wrote:
If it weren't half the area, would the answer be 1/9?


Yes, if it were asking for the ratio of the whole original and bigger circles, the answer would be 1/9.
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