## jaersyn Group Title sketch the polar equation r = 4sin(t) one year ago one year ago

1. Mathmuse Group Title

Start with your critical points. 0, pi/2, pi, 3pi/2, 2pi you should be familiar with the values of sin(t) at these points. multiply by 4 and plot the points, connect the point to obtain a rough sketch

2. jaersyn Group Title

don't i have to find the rectangular equation for this first?

3. Mathmuse Group Title

you can plot it in rectangular coordinates...but since the radius is given in terms of an angle, you can plot it directly to a polar plot

4. Mathmuse Group Title
5. jaersyn Group Title

True, can you help me graph it using rectangular coordinates? Haven't gotten around using polor coordinates yet

6. jaersyn Group Title

|dw:1355515747517:dw|

7. phi Group Title

you could write your rectangular equation as $x^2 + y^2 +4y =0$ now complete the square on y

8. phi Group Title

although I am not sure where your r= -4 sin $$\theta$$ came from Up top, it is r= +4 sin $$\theta$$