Catriona Agg
@catrionaagg.bsky.social
Maths teacher. I aim to share lots of snippets of my lessons using #MathsToday and would encourage you to do the same!
Also occasional geometry puzzles 🧩
Also occasional geometry puzzles 🧩
Wow that’s commitment! But I do love scrolling back through - there’s so much good stuff being shared!
November 11, 2025 at 5:59 PM
Wow that’s commitment! But I do love scrolling back through - there’s so much good stuff being shared!
I was barcode scanning today too - agree it’s one of the best jobs. And in the winter, you can do it without having to take your gloves off!
November 8, 2025 at 11:51 AM
I was barcode scanning today too - agree it’s one of the best jobs. And in the winter, you can do it without having to take your gloves off!
It uses the 45 degree angle at Q, but ignores the rest of the triangle
October 27, 2025 at 2:52 PM
It uses the 45 degree angle at Q, but ignores the rest of the triangle
My instinct was to start with a circle centred at O. It seems far too much of a coincidence to have a point labelled O if you’re not going to centre a circle there!
(And it works out nicely: If U and S are on this circle, then so is Q, since UOS = 2*UQS. So OU=OQ, and you to find the area)
(And it works out nicely: If U and S are on this circle, then so is Q, since UOS = 2*UQS. So OU=OQ, and you to find the area)
October 27, 2025 at 1:31 PM
My instinct was to start with a circle centred at O. It seems far too much of a coincidence to have a point labelled O if you’re not going to centre a circle there!
(And it works out nicely: If U and S are on this circle, then so is Q, since UOS = 2*UQS. So OU=OQ, and you to find the area)
(And it works out nicely: If U and S are on this circle, then so is Q, since UOS = 2*UQS. So OU=OQ, and you to find the area)
I love this about some of the Underground Maths questions - it’s amazing how much more invested students are when you point out that they’re doing an exam question from the 1960s
October 25, 2025 at 4:53 PM
I love this about some of the Underground Maths questions - it’s amazing how much more invested students are when you point out that they’re doing an exam question from the 1960s
I like “using examples to back up your reasoning” - I’ll be stealing that for next time I do one of these. Which of the four did you think generated the most interesting responses?
October 24, 2025 at 8:43 PM
I like “using examples to back up your reasoning” - I’ll be stealing that for next time I do one of these. Which of the four did you think generated the most interesting responses?