Quarto Basics

Polar Axis

For a demonstration of a line plot on a polar axis, see Figure 1.

Code 
import numpy as np
import matplotlib.pyplot as plt

r = np.arange(0, 2, 0.01)
theta = 4 * np.pi * r**2
fig, ax = plt.subplots(
  subplot_kw = {'projection': 'polar'} 
)
ax.plot(theta, r)
ax.set_rticks([0.5, 1, 1.5, 2])
ax.grid(True)
plt.show()
Figure 1: A line plot on a polar axis

Euclidean Coordinates

See Figure 2

Code 
x = r*np.sin(theta)
y = r*np.cos(theta)

fig, ax = plt.subplots(figsize=(5, 5))

ax.plot(x, y);
# ax.axis('off');
Figure 2: A line plot using the x and y coordinates