Vectors are Arrows showing where an object is going and how fast/far.
Cah. The C stands for Cos, A stands for Adjacent, H is for Hypothesis.
Toa. The T is for Tan, O is for Opposite, and A is for Adjacent.
Hypothesis is always the longest side, Adjacent is the side next to the angle your looking for. Opposite is the side across from the angle your trying to find.