# Rectangular to Polar Equation Calculator + Online Solver With Free Steps

**The Rectangular to Polar Equation calculator** deals with two coordinate systems: the rectangular or the Cartesian Coordinate System and the Polar Coordinate System.

These two systems are used to determine the position of a point in a 2D plane. The Rectangular to Polar Equation calculator is used to determine the position of the point P(x,y) by finding the polar coordinates (r,θ).

**What** Is** a Rectangular to Polar Equation Calculator?**

**A rectangular to polar equation calculator is an online calculator that converts two-dimensional rectangular coordinates into polar coordinates.**

This calculator takes rectangular components x and y as input where x is the distance of a point P from the origin (0,0) along the x-axis and y is the distance of the point P from the origin along the y-axis.

The polar coordinates r and θ give the position of point P where r is the **radius of the circle** or the distance traveled from the center of the circle to the point P. θ is the **angle from the positive** x-**axis** in the **counterclockwise direction**.

Polar equation is given as:

\[ y = r (e)^{ι.θ} \]

It is obtained from the rectangular coordinate equation (x+ιy).

## How To Use Rectangular to Polar Equation Calculator

Here are the steps required to use the rectangular to polar equation calculator.

### Step 1:

Enter the x and y coordinate values against the blocks titled **x** and **y** respectively.

### Step 2:

Press the submit button for the calculator to process the polar coordinates r and θ.

### Output:

The output will show four windows as follows:

### Input Interpretation:

The calculator shows the interpreted values for the x and y coordinates for which the polar coordinates are determined. The default values set for the x and y coordinates are 3 and -2, respectively.

### Result:

The result block shows the values for r and θ. The value of r is obtained by putting the values of x and y in the following equation:

\[ r = \sqrt{ (x)^2 + (y)^2 } \]

The value of r shows the vector length or magnitude of the resultant vector which is always a positive value.

Also, the value of θ is obtained by putting the values of x and y in the following equation:

\[ \theta = \arctan (\frac{y}{x}) \]

The positive value of θ shows a counter-clockwise direction from the x-axis and the negative value shows a clockwise direction from the x-axis.

### Vector Plot:

The vector plot shows a 2D graph with positive and negative x and y rectangular coordinate axes.

The resultant vector is drawn by the output polar vectors (r, θ) with magnitude r taken from the origin and angle θ taken from the positive x-axis. The quadrant of the resultant vector is determined by the (x,y) coordinates displayed on the plot.

### Vector Length:

The vector length shows the magnitude r of the resultant vector.

## Examples

Here are some examples that are solved using a **Rectangular to Polar Equation Calculator.**

### Example 1:

For the rectangular coordinates

\[ (2, 2(\sqrt{3})) \]

find the polar coordinates (r,θ).

### Solution:

x = 2 and \[ y = 2(\sqrt{3}) \]

Putting the values of x and y in the equations of r and θ:

\[ r = \sqrt{ (x)^2 +(y)^2 } \]

\[ r = \sqrt{ (2)^2 + (2(\sqrt{3}))^2 } \]

\[ r = \sqrt{ 4 + 12 } \]

\[ r = \sqrt{ 16 } \]

**r = 4 **

\[ \theta = \arctan (\frac{y}{x}) \]

\[ \theta = \arctan (\frac{2(\sqrt{3})}{2}) \]

\[ \theta = \arctan ( \sqrt{3} ) \]

**$\theta$ = 60°**

Figure 1 shows the resultant vector of example 1.

The same results are obtained using the calculator.

### Example 2:

For the rectangular coordinates

\[ (-3(\sqrt{3}) , 3) \]

find the polar coordinates (r,θ).

### Solution:

\[ x = -3(\sqrt{3}) \] and y = 3

Putting the values of x and y in the equation of r:

\[ r = \sqrt{ ( -3(\sqrt{3}) )^2 + ( 3 )^2 } \]

\[ r = \sqrt{ 27 + 9 } \]

\[ r = \sqrt{ 36 } \]

**r = 6 **

For the value of θ, ignoring the negative sign of 3(\sqrt{3}) for the reference angle Φ.

The result is shown as:

\[ \Phi= \arctan (\frac{3} {3(\sqrt{3}) }) \]

\[ \Phi = \arctan (\frac{1} {\sqrt{3}}) \]

**$\Phi$ = -30° **

Adding 180° to Φ will give the angle θ.

The angle θ is given as:

\[ \theta = -30° + 180° \]

** $\theta$ = 150° **

Figure 2 shows the resultant vector for example 2.

The same results are obtained using the calculator.

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*All the images are created using GeoGebra.*