import matplotlib.pyplot as plt
circle = plt.Circle((0.5, 0.5), 0.2, fill = False)
fig, ax = plt.subplots()
ax.add_artist(circle)
ax.set_xlim(0, 1)
ax.set_ylim(0, 1)
plt.gca().set_aspect('equal', adjustable='box')
plt.show()
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