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Graph of r = a
Circle centered at the pole with a radius of |a|

Graph of r = acosθ
Circle centered on the line θ = 0, |a|/2 units from the pole, radius = |a|/2

Graph of r = asinθ
Circle centered on line θ = π/2, |a|/2 units from pole, radius = |a|/2

Graph of r = a ± bsinθ if a/b = 1
Cardioid, centered on line θ = π/2

Graph of r = a ± bcosθ if a/b = 1
Cardioid, centered on line θ = 0

Graph of r = a ± bsinθ if a/b < 1
Limacon with an inner loop, centered on line θ = π/2

Graph of r = a ± bcosθ if a/b < 1
Limacon with an inner loop, centered on line θ = 0

Graph of r = a ± bsinθ if 1 < a/b < 2
Limacon with a dimple, centered on line θ = π/2

Graph of r = a ± bcosθ if 1 < a/b < 2
Limacon with a dimple, centered on line θ = 0

Graph of r = a ± bsinθ if a/b ≥ 2
Convex limacon with no inner loop or dimple, centered on line θ = π/2

Graph of r = a ± bcosθ if a/b ≥ 2
Convex limacon with no inner loop or dimple, centered on line θ = 0

Graph of r=asinnθ where n is odd
Rose, n petals

Graph of r=asinnθ where n is even
Rose, 2n petals,

Graph of r=acosnθ where n is odd
Rose, n petals,

Graph of r=acosnθ where n is even
Rose, 2n petals,

Graph of r = aθ
Spiral
