# How do you find the rectangular coordinate of (2, pi/5) ?

color(purple)(x ~~ 1.618, y ~~ 1.176
$\left(r , \theta\right) = \left(2 , \left(\frac{\pi}{5}\right)\right)$
$x = r \cos \theta = 2 \cdot \cos \left(\frac{\pi}{5}\right) \approx 1.618$
$y = r \sin \theta = 2 \cdot \sin \left(\frac{\pi}{5}\right) \approx 1.176$