CHAPTER 9 KEY FORMULAS AND EQUATIONS

Three position vectors.
Vector addition by components
Ax = A cos θAy = A sin θ(9.1)
R = Rx2 + Ry2(9.2)
θref = tan − 1| Ry| | Rx| (9.3)
Law of sines
asin A = bsin B = csin C(9.8)
Triangle Ay B C with sides ay, b, and c opposite angles Ay, B, and C, respectively.
Law of cosines
a2 = b2 + c2 − 2bccos Ab2 = a2 + c2 − 2accos Bc2 = a2 + b2 − 2abcos C(9.13)

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