from sectionproperties.pre.library import channel_section
from sectionproperties.analysis import Section

geom = channel_section(d=200, b=75, t_f=12, t_w=6, r=12, n_r=8)
geom.create_mesh(mesh_sizes=[5.0])

sec = Section(geom)
sec.calculate_geometric_properties()
sec.calculate_plastic_properties()
sec.calculate_warping_properties()

sec.plot_centroids()