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How do i use trigonometry to find out the angle in a triangle? which buttons do i press?

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Sorry to say it, bu Mathematics is not Mathemagic: you cannot do things with the shaking of a wand.

There are several ways to find one angle in a right triangle when you have the measures of the sides. You must have the triangle drawn in front of you and then decide if you use the sine, the cosine or the tangent. I cannot presume to know what your triangle looks like.

I suggest you look at the definitions of the trigonometric ratios and find out what is given in your problem.

If you use a ratio to find the cosine, you can then use the arcsine function to find the angle.
If you use one particular ratio to find the sine, you can then use the arcsine to find the angle.

If you know two sides a and b and you know the angle (B) opposite side b, you can use the sine formula (sin(A)/a=sin(B)/b) to determine sin(A) then use the arcsine of the result to get angle A.

Do post a comment to this thread with the case you are trying to solve.

Posted on Nov 26, 2010

  • k24674 Nov 27, 2010

    OOPS. The line 'If you use a ratio to find the cosine, you can then use the arcsine function to find the angle.' should read 'f you use a ratio to find the cosine, you can then use the arc cosine function COS^-1 to find the angle.'

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