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 Post subject: A simple problem, I think...Posted: Wed, 4 Jun 2003 06:02:10 UTC
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Joined: Wed, 4 Jun 2003 05:55:34 UTC
Posts: 1
Very rusty on how to do this, any help would be appreciated.

Given:
Triangle ABC

angle A= 90
angle B= 20
angle C= 70

Side BC = 9

How can I calculate Side AB's length with the information given?

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 Post subject: Re: A simple problem, I think...Posted: Wed, 4 Jun 2003 06:11:29 UTC
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Joined: Fri, 2 May 2003 14:09:58 UTC
Posts: 2482
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Golytelee wrote:
Very rusty on how to do this, any help would be appreciated.

Given:
Triangle ABC

angle A= 90
angle B= 20
angle C= 70

Side BC = 9

How can I calculate Side AB's length with the information given?

This is a right angled triangle, so you can use the trig ratios to solve this problem. Draw the triangle out.

Knowing that side BC is opposite from angle A (90 degree angle), that would be the hypothenuse and the longest side...

Using the 70 degree angle at C, you can use the sine ratio:

Theta would be your angle of 70 degrees. Opposite of this angle is side AB, and the hupothenuse is 9

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