this work can involve setting up and solving linear equations and forming linear relationships
and generalisations (that can be proved)
an orthogonal polygon just has right angles and 270 degree angles (that I like to call 'left' angles) inside it
[sometimes these are called 'rectilinear polygons'
but 'rectilinear' idetifies shapes that are 'bounded by straight lines' rather than those involving multiples of 90 angles]
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