Forces f1 and f2 with magnitudes 2.80 kn and 4.10 kn respectively, act at point o. determine the magnitudes in kilonewtons and directions in degrees counterclockwise from the x-axis of the following resultant forces. (a) r1(a) r1 = f1 + kn direction ° counterclockwise from the +x-axis(b) r2 = f1 − f2magnitude direction ° counterclockwise from the +x-axis(c) r3 = f2 − f1magnitude direction ° counterclockwise from the +x- show all work