Write the polar coordinates (3, pi) in rectangular form

See below.

Step-by-step explanation:

In polar coordinate system, we have two parameters describing a point. The first one is its distance from the origin and second its angle with respect to the positive X axis.

The point ( 3 , pi ) will have a distance of 3 units from the origin. The angle made is pi radians or 180 degrees. The negative Y axis is at 180 degrees from the positive X axis.

Hence the point at a distance of 3 units on the negative Y axis is ( -3 , 0 )