# Area of engineering shapes
# Scope: Rectangle with one circular cutout fully inside it.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

length = 200 mm
width = 100 mm
radius = 20 mm

area := length*width-pi*radius^2 [mm^2]
perimeter := 2*(length+width)+2*pi*radius [mm]

check hole fits width: 2*radius <= width

scenario alternative: length = 160 mm