You know you're a math teacher when you look at an actual garden design and decide it would be a good example for scale drawings....
Design for a small back town garden on a low budget
raised garden beds against a fence | raised vegetable garden along fence raised bed garden made easy
low maintenance landscape - and well draining driveway border
CURVES WONDERFUL CURVES: Good Lines Mean Good Designs – Part 2 « Not Another Gardening Blog
Small family garden : Angie Barker Trading as Garden Design for All Seasons
curved lawn with easy path to get to the end of the garden without getting muddy.
June 2009 Butterfly World's project with new oak railway sleepers 8
Raised bed seating in beautifully coloured garden