Question

Polar coordinates of Q are (26, 80). Which is x-axis of this point in rectangular system?

A. 4.51
B. 4.25
C. 5.21
D. 5.41

Answer 1

As we know, rectangular and polar coordinates are related by the following formulas:
x=r cos(fi)
y=r sin(fi)
So, we obtain x=26*cos(80)=4.51 which is A.