Using Similar Triangles To Find Unknown Length

Trigonometric ratios and functions, the unit circle, inverse trig functions, identities, trig graphs, etc.
2013c7vette
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Using Similar Triangles To Find Unknown Length

Postby 2013c7vette » Tue Dec 21, 2010 4:41 pm

Hi everyone, I have a problem in my math book that says:
A telephone pole has a shadow of 16ft. when a person 5ft. tall has a shadow of 6ft. How tall is the pole?

My book says to draw a diagram to help, but I'm not sure what to draw. It also says that I should use the ratios of similar triangles to find the unknown dimension. Any Help would be much appreciated.

Thanks,
2013c7vette

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stapel_eliz
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Postby stapel_eliz » Tue Dec 21, 2010 8:59 pm

2013c7vette wrote:
A telephone pole has a shadow of 16ft. when a person 5ft. tall has a shadow of 6ft. How tall is the pole?

My book says to draw a diagram to help, but I'm not sure what to draw. It also says that I should use the ratios of similar triangles to find the unknown dimension. Any Help would be much appreciated.

I'm surprised that your book does not contain any examples of this. To see a couple of worked examples, try here. :wink:

2013c7vette
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Joined: Fri Nov 05, 2010 5:55 pm
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Re: Using Similar Triangles To Find Unknown Length

Postby 2013c7vette » Tue Dec 21, 2010 10:00 pm

Thanks :)


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