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plotcircle(r = 1, ...)
plotellipse
emptyplot(c(0, 1), c(0, 2), main = "plotcircle") plotcircle(mid = c(0.5, 0.5), r = 0.25, from = 0, to = 3*pi/2, arrow = TRUE, arr.pos = 0.5, col = "red")
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