| x is greater than y | small theta |
| y is greater than x | large angle |
| x= half hypotenuse | theta is 60 and x is betweeen half y and 2/3 y |
| y = half hypotenuse | theta is 30 y between half x and 2/3 x |
| cos 60 | .5 |
| sin 30 | .5 |
| sin 45 | cos 45 = .71 |
| 3-4-5 triangle | 37/53/90 angles |
| largest sum of vectors | must be in same direction, add them |
| smallest sum of vectors | must be in opposite directions, subtract them |
| perpinicular vectors | pythagorean therum |
| hypotenuse must be ... | bigger than biggest one and samller then the sum |