Trig problem

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Trig problem

Post by Azein on Sun Aug 27, 2017 9:16 am

I just retook the SAT so my brain is fried. Can anyone explain the method used to find the angle (theta)
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Re: Trig problem

Post by Purple KEA on Sun Aug 27, 2017 9:24 am

You can use Tan to find the side without finding C.

Tan (θ) = Opposite / Adjacent
Tan (θ) = 1400/2.3
θ = tan-1(1400/2.3)

Plug it in to a calculator and you get:
θ = 89.9°

This would make sense considering the hugely disproportionate lengths of this triangle.

Basically you can use the SohCahToa principle to find the inside angles of a right angle triangle as long as you know two sides. Follow the steps above, but changing the lengths depending on the triangle should give you correct answers.

Also good to remember that the inside angles of a triangle always equal 180 degrees.

Hope this helps, and if I've made a mistake i apologise, haven't done this since high school.
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Re: Trig problem

Post by Autocrat on Sun Aug 27, 2017 1:44 pm

Yup that looks right, purple. I use another way to remember it. Sin theta = perpendicular/hypotenuse
cos theta= base/hypotenuse
tan theta = perpendiculur/base
The silly sentence I use to remember this is...
Some People Have Curly Brown Hair Through Proper Brushing.
The base line is the one which has the angle and the 90 degree sign on it.

Good luck with your SATs
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Re: Trig problem

Post by Purple KEA on Sun Aug 27, 2017 9:59 pm

Yeah that's a good way as well. I just remember my crazy french year 9 math teacher yelling SOHCAHTOA to us in the first day of class, and that's how I've remembered it ever since.
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Re: Trig problem

Post by Lokandur on Mon Aug 28, 2017 6:32 am

I will remember SOH CAH TOA until the day that I die.
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