Trigonometry is the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
Oh, so, how do you do it?
So there are three things to know; sin, cos, and tan.
Wait that's so much I can't remember it.
So, an easy way to remember this is SOH (sin = Opposite/Hypotenuse). CAH (cos = Adjacent/Hypotenuse), and TOA (tan = Opposite/Adjacent). Making SOHCAHTOA.
Wait you forgot to explain what those mean!
Oh, my bad! Sin, cos, and tan are signs used in trigonometry to find out the angle of a triangle.
Why are there three different ones?
Each one correlates to what pair of sides of the triangle you know, if it's opposite then that line is opposite of the triangle, if it's adjacent then its the line next to the angle, and if it's hypotenuse then it's the longest line in the triangle.