# Second moment of area
# Scope: Solid rectangular section about its centroidal bending axis.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

width = 25 mm
depth = 12 mm

inertia := width*depth^3/12 [mm^4]
sectionModulus := 2*inertia/depth [mm^3]

check stiffness target: inertia >= 3000 mm^4

scenario alternative: width = 20 mm