# What is the Cartesian form of (25,(-7pi )/4)?

Mar 27, 2017

$\left(17.677 , 17.677\right)$

#### Explanation:

To change from polar form to Cartesian form, use $x = r \cos \theta$ and $y = r \sin \theta$

$x = 25 \cos \left(\frac{- 7 \pi}{4}\right) = 17.677$

$y = 25 \sin \left(\frac{- 7 \pi}{4}\right) = 17.677$

So in Cartesian form:

$\left(17.677 , 17.677\right)$