Algebra Problem:

Question

Write 5∠ 210° in rectangular coordinates.

(A) 3.46 R - 2 U

(B) 2.5 R - 3.46 U

(C) -4.33 R - 2.5 U

(D) -2 R + 3.46 U

(E) None of the above

Answer 1

magnitude 5, angle 210 degrees

210 degrees is in the 3rd quadrant, so the x value and y value will both be negative---draw a picture to see this.

X value: 5*cos(210) = -4.33 (Left = -Right)

Y value: 5*sin(210) = -2.5 (Down = - Up)

Thus it's your (C) answer.....