I always find this really tricky; look up diagrams on the internet to see how they come out. If you are fortunate enough to have a graphical calculator: use it.

Polar equations of the form r = a give a circle centre O, radius a

Polar equations of the form Θ = α give a half line throuhg O at an angle α to the initial line

Polar equations of the form r = aΘ give a spril starting at O

Other sketches are not so easily learned: try drawing up a table of values and carefuly plotting the shapes.

## Comments

Report