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If it's a right angled triangle use Sine, Cosine and Tan.

x= the angle H= hypotenuse (the longest side) O = opposite to the angle you are given or trying to find A= adjacent to the angle you are given or trying to find.

Sinx = O/H
Cosx = A/H
Tanx = O/A

To find the angle just work out the O/H A/H or O/A bit and inverse whichever one from Sin Cos or Tan you used

If it's a right angled triangle use Sine, Cosine and Tan.

x= the angle H= hypotenuse (the longest side) O = opposite to the angle you are given or trying to find A= adjacent to the angle you are given or trying to find.

Sinx = O/H
Cosx = A/H
Tanx = O/A

To find the angle just work out the O/H A/H or O/A bit and inverse whichever one from Sin Cos or Tan you used

They're all right angles so how would u find the measure of an angle using sine, cosine, or tan? Geometry is really hard for me.

If they're all right angle triangles then you know that 1 of the 3 angles is 90 degrees. If you are also given some of the lengths of the sides, then you can use the sin, cos and tan as described by Darth Cara. You may need to calculate some of the lengths of the sides if they are not given and for that, you use the exact same formulas, only you re-arrange to solve for the unknown variable (assuming you know the angle and another side length).

You need to use the inverse function (sin, cos, or tan) to find the angle given side lengths. For example, sin x = opposite/hypotenuse. You can calculate o/h, which equals sin x, all you have to do is take sin(-1) of o/h, which is easy with a calculator, not so much without.

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