# What is the Cartesian form of ( 4, (25pi)/8 ) ?

Use $x = r \cos \left(\theta\right)$ and $y = r \sin \left(\theta\right)$, to compute the point.
The cartesian point is $\left(4 \cos \left(\frac{25 \pi}{8}\right) , 4 \sin \left(\frac{25 \pi}{8}\right)\right)$
Here is the decimal form $\left(3.941 , 0.682\right)$