7.3 Polar Coordinates

[STARTS AT 9:17]

Professor: So what we're going to do is plot some points in this plane. The first is 2 comma pi over 4. That means a radius of 2. So I'm actually living on this circle here. And I want to go to an angle of pi over 4, which would be this point right here. So my point for part a is that right there. 

For part B, I'm living on the circle with a radius of 3. See if I can just label that clearly right there. There's a radius of 3. And I'm going to 2 pi over 3. So if we're on this circle, we can go to 2 pi over 3. This is not where my point is going to be, because my radius here is negative 3. So rather than actually going here, I'm going to go in the opposite direction. So it's actually going to be over here, 5 pi over 3 with a radius of 3. 

So a negative radius travels backwards. We're traversing in the opposite direction. 

Last point here, 4, 5 pi over 4. So a radius of 4. I am living on this circle. And going to 5 pi over 4 which happens to be right over here. So I'm on this circle. And I'm going over to 5 pi over 4. So this point right here. That is my point for part C. 

[ENDS AT 11:04]