"Geometrical Properties of Zed Section
'<hr /><div style="max-width:120mm"><img style="height:150pt;" alt="zed.png" class="side" src="https://calcpad.eu/media/mechanics/sections/zed.png"></div>
'Dimensions
h = ?'%u,'t_w = ?'%u
b_f = ?'%u,'t_f = ?'%u
'Area
A_w = h*t_w'%u<sup>2</sup>
A_f = (b_f - t_w)*t_f'%u<sup>2</sup>
A = A_w + 2*A_f'%u<sup>2</sup>
'Centroid
y_c = b_f - t_w/2'%u
z_c = h/2'%u
'Perimeter
P = 2*(h + 2*b_f - t_w)'%u
'Second moments of area
I_y = (b_f*h^3 - (b_f - t_w)*(h - 2*t_f)^3)/12'%u<sup>4</sup>
I_z = ((h - 2*t_f)*t_w^3 + 2*t_f*b_f*(b_f^2 + 3*(b_f - t_w)^2))/12'%u<sup>4</sup>
I_yz = -b_f*(h - t_f)*A_f/2'%u<sup>4</sup>
'Principal moments of area
I_1 = (I_y + I_z)/2 + sqrt((I_y - I_z)^2/4 + I_yz^2)'%u<sup>4</sup>
I_2 = (I_y + I_z)/2 - sqrt((I_y - I_z)^2/4 + I_yz^2)'%u<sup>4</sup>
'Angle of principal axis
α_1 = atan((I_y - I_1)/I_yz)'<sup>о</sup>
'Polar moment of area
I_x=I_1+I_2'%u<sup>4</sup>
'Radii of gyration
r_y = sqr(I_y/A)'%u
r_z = sqr(I_z/A)'%u
r_x = sqr(I_x/A)'%u20	2	10	5