Question

find the rectangular coordinates for (-4, pi/2)

Answer 1

help

Answer 2

\(\bf \left(-4,\frac{\pi}{2}\right)\qquad \qquad x=r\cdot cos(\theta)\qquad y=r\cdot sin(\theta)\qquad thus\\ \quad \\
x=(-4)cos\left(\frac{\pi}{2}\right)\qquad \qquad y=(-4)sin\left(\frac{\pi}{2}\right)\)

Answer 3

so get the value for \(\bf \cfrac{\pi}{2}\) from your Unit Circle, and multiply away, to get the (x, y) rectangular coordinates

Answer 4

thanks

Answer 5

yw