In much the same way as you use rectangular coordinates.
With Cartesian or rectangular coordinates, you start from the origin and move a distance of x in the horizontal direction and then a distance of y in the vertical direction.
Using polar coordinates, you start from the origin along a ray inclined at an angle theta with the positive horizontal axis (clockwise from Eastwards), and you go a distance r along that ray.
In all but degenerate cases the Cartesian coordinates of (r, theta) are
x = r*cos(theta) and y = r*sin(theta)
while, conversely,
r = sqrt(x2 + y2) and theta = arctan(y/x).
You don't!
By substitution
Boats use them to navigate.
absolute relative and polar coordinates definition
You do not have to. You could use polar coordinates, if you prefer.
In systems of equations, the graphing method is solving x and y by graphing out the two equations. x and y being the coordinates of the two line's intersection.
The point whose Cartesian coordinates are (2, 0) has the polar coordinates R = 2, Θ = 0 .
It is important for beginners because the coordinates of the graphing points are measured from the origin. More expert users don't need to do so.
The point whose Cartesian coordinates are (-3, -3) has the polar coordinates R = 3 sqrt(2), Θ = -0.75pi.
Check: wikiHow Plot-Polar-Coordinates Made things a lot easier.....
(-4,0)
pole
(-6,6)
True
Polar coordinates are another way to write down a location on a two dimensional plane. The first number in a pair of coordinates is the distance one has to travel. The second number in the pair is the angle from the origin.
You can use a scientific calculator to convert from polar coordinates (length and direction) to rectangular coordinates (x-coordinate and y-coordinate). Most calculators have such a function directly; it is much easier to use this, than to use the special trigonometric formulae. Then, add the x- and y-components separate. You may want to convert the end-result back to polar coordinates - once again, use the special functions on your calculator, in this case, rectangular-to-polar conversion.
x-axis = polar axis