I thought I would add the incredible Chenier's Practical Math Dictionary, and it's companion, Chenier's Practical Math Application Guide. They both are super, going from the basics of math and going through to ever aspect of practical math for all of the trades.....using levels,measuring tools,layouts, wood or metal......it's all covered there...I'm abit math challenged but I can do practical trig. Chenier has an interesting background that's on his website.....they are definitely worth a look.
He covers layout of all shapes known to man in great and simple detail.
