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.
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