These constructions are revised from:[br]Applet: Building with Snap Cubes https://www.ggbm.at/WTF5hPut[br]Authors: GeoGebra Team, IM 6-8 Math
MathsPad[br] https://www.mathspad.co.uk/i2/plansElevations.php
1. 李月貞《從不同角度看立體》[br] https://cd1.edb.hkedcity.net/cd/maths/en/ref_res/material/S%20&%20Space/trial/T8.pdf[br]2. nctm[br] https://www.nctm.org/Classroom-Resources/Illuminations/Interactives/Isometric-Drawing-Tool/[br]3. Ron Kremer 'Exploring with Squares and Cubes'[br] https://www.amazon.com/Exploring-Squares-Cubes-Ron-Kremer/dp/0866514708[br] https://youtu.be/BsUjmg-QQ2E