SOLUTION: Find the rectangular coordinates of the point whose polar coordinates are: {{{(matrix(1,3,-7.2,",",pi/5))}}} Round your answer to three significant digits. x = y =

That's this point:



Notice in the above graph, that θ is in QI, but
r is negative.  So we find the angle 
in QI indicated by the dotted line and the red
arc.  But then since r = -7.2, we go 7.2 units
in the OPPOSITE direction, which puts the point
in QIII.  Now from that point, we draw a perpendicular 
up to the x-axis. 



So the x-ccordinate of the point is 



and the y-coordinate of the point is



The point in rectangular coordinates to three significant
digits is (-5.82,-4.23)

Edwin