# What is the Cartesian form of ( 9 , (25pi)/12 ) ?

Apr 25, 2018

$\left(9 \cos \left(25 \frac{\pi}{12}\right) , 9 \sin \left(25 \frac{\pi}{12}\right)\right)$

#### Explanation:

if $\left(r , \phi\right) = \left(9 , 25 \frac{\pi}{12}\right)$

Link between polar coordinates and Cartesian coordinates:
x=rcos(phi), y=rsin(phi)
r is the distance from the (0,0), and $\phi$ is the angle.

Now
$x = 9 \cos \left(25 \frac{\pi}{12}\right)$
$y = 9 \sin \left(25 \frac{\pi}{12}\right)$