< is angle symbol

Ris the resultant of the three forcesA,B, andC, that isR = A+B+CIf

A=A< 210,B= 100<20,C= 100<120, andR= R<195, use the component method to determine A and R.

ok so I broke them into components but have no idea how to find A and R..any help appreciated.

Ax= A cos 30= -?

Ay= A sin 30 = -?

Bx = 100 cos 20 = 93.9

By = 100 sin 20 = 34

Cx=100 sin 30= -50

Cy=100 cos 30= 86.6

Rx = R sin 15

Ry= R cos 15

where to begin...