Drawing a Circle in R

Given some fixed radius, is there a way to draw a circle in R ?

For instance, a square of fixed sides can be drawn like this:

ggplot() + 
  geom_rect(aes(xmin = 1, 
                xmax = sqrt(pi), 
                ymin = 1, 
                ymax = sqrt(pi))) + 

Can the same be done for a circle?



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