Just musing...DD asked me for a new protractor today. I enquired as to whether the rest of her geometry set was okay, and she replied that she'd never used the two set squares. She's in Year 11.
Thinking about it, I don't remember using my set squares when I was at school either. I asked DH (maths, further maths A-levels) and he also hadn't!
So...have you ever used a set square? Would you know how to use one? And how many Olympic-sized swimming pools could we fill with all the unused set squares from our DC's geometry sets? 🙂