# What is the Cartesian form of (-4,(-19pi)/4))?

Feb 27, 2018

(2.8, 2.8)

#### Explanation:

To turn polar coordinates into Cartesian form we use the following formulas: $\left(x , y\right)$

$x = r \cos x$

$y = r \sin x$

In the polar coordinates $r$= -4, and $x$= $- \frac{19 \pi}{4}$

Then, we insert these values into the formulas:

$x = - 4 \cos \left(- \frac{19 \pi}{4}\right) = 2.8$

$y = - 4 \sin \left(- \frac{19 \pi}{4}\right) = 2.8$

Therefore, the coordinates in Cartesian form is : $\left(2.8 , 2.8\right)$