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