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In polar coordinates you can graph an equation like, r=a(1-sinθ) which gives a cardioid graph.

But when my teacher giving me a class of

__sketching in polar coordinates__then he ask to sketch θ=π/4.

But as we know that in polar coordinates (r,θ).

so in θ=π/4, there is no "r", so how we can graph it?

I think there must be some "r" which could make angle with +x-axis, if we take "r=0" then how could you make inclination with x-axis by π/4?

How will do this???