Catriona Agg

@Cshearer41

Maths teacher and fan of geometric puzzles.

Joined February 2018
734 Photos and videos Photos and videos

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  1. Pinned Tweet
    12 Feb 2021

    I’ve updated my collection of screenshots. Hopefully useful for anyone who likes seeing lots of colourful geometry puzzles all on the same page. 😁

    42 replies . 106 retweets 538 likes
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  2. Retweeted
    Apr 7

    We've added a new session to the programme for the first day of . This will be a special Q&A with some of the authors of including and .

    1 reply . 5 retweets 10 likes
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  3. Apr 4

    What’s the total area of this regular hexagon?

    37 replies . 51 retweets 251 likes
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  4. Retweeted
    Apr 1

    The geometry bug is catching - here's another puzzle, from a different student. Love this one! 😍

    5 replies . 8 retweets 55 likes
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  5. Retweeted
    Mar 29

    One of our Year 13 mathematicians wrote this lovely puzzle. It definitely challenged the rest of the class! How would you solve it?

    A square with lines of length 3, 1 and 2 from consecutive corners meeting at a point inside the square. Text alonside reads "What is the area of the square? (and what are my 2 favourite prime numbers?)"
    12 replies . 24 retweets 203 likes
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  6. Mar 16

    The two coloured triangles each have area 9. What’s the total area of the three squares?

    32 replies . 49 retweets 276 likes
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  7. Mar 15

    Chocolate biscuits, cheese straws and talking about his favourite puzzle for 😁

    3 replies . 1 retweet 44 likes
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  8. Retweeted
    Mar 12

    Another great puzzle. Michael Penn:

    7 replies . 20 retweets 145 likes
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  9. Mar 10

    The angles problem is from my favourite ever puzzle book, Geometry Snacks by and . And the whole chains of reasoning idea is heavily influenced by and the Mathematical Thinking project that your local Maths Hub is almost certainly running.

    1 reply . 1 retweet 10 likes
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  10. Mar 10

    The squares puzzle is one that I think I first saw in a tweet from . added it to our SOW last year (he says he heard it from ) and modelled it to us in a dept meeting - so lots of the ideas about presenting it are really his!

    2 replies . 8 likes
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  11. Mar 10

    I should probably add that neither of the puzzles I used, and very few of the ideas I talked about, are my own. Like all teachers I’m great at nicking stuff from all kinds of places 😁

    2 replies . 11 likes
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  12. Mar 10

    Here’s the video of last night’s webinar. If you’ve wondered how to use puzzles as the basis for classroom activities this might give you some ideas. Thank you to everyone who came to play - I had so much fun!

    4 replies . 31 retweets 113 likes
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  13. Retweeted
    Mar 10

    Many thanks again for such a brilliant session yesterday. I took your advice and added a circle to the second problem. What a beautiful proof without words!

    An isosceles triangle attached to a square by one if its equal sides.
    2 replies . 4 retweets 18 likes
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  14. Mar 8

    This time tomorrow I’m going to attempt to show how I use a couple of geometry puzzles with Year 7s. Lots of visualising, not too much algebra. Come and join in!

    Our guest speaker series continues this Wednesday at 1 PM EST with Catriona Agg (). Join us as Catriona explores "Generalising with Geometry." Sign up at . If you're teaching then, perhaps have your class join!
    5 replies . 8 retweets 52 likes
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  15. Retweeted
    Mar 4

    What's your method?

    68 replies . 38 retweets 225 likes
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  16. Retweeted
    Mar 2

    Guest Speaker Series News: Our next session with Catriona Agg () is Wed, 3/9 at 1 PM EST/6 PM GMT. Sign up at The recording from Monday's talk with Dan Finkel () is available at the link below. 👇

    1 reply . 7 retweets 39 likes
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  17. Mar 2

    (I mean, just look at this list 🤩🤩🤩)

    2 replies . 4 retweets 32 likes
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  18. Mar 2

    Ok, I have a confession: when asked me to check the final proofs for my pages, I got access to a folder of everyone’s contributions. So naturally, I’ve sneaked several big peeks… and there is some AMAZING stuff in this book.

    Our brilliant new title 'If I Could Tell You One Thing' edited by is now in stock. It costs £9.80 for Mathematical Association members and £14 for non-members with £2 for delivery.
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    3 replies . 11 retweets 54 likes
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  19. Retweeted
    Mar 2

    If, like us, you enjoy Catriona's puzzles, you'll want to order a copy of today! 30% discount for MA members.

    1 reply . 4 retweets 19 likes
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  20. Feb 21

    What’s the area of the quarter circle?

    61 replies . 75 retweets 409 likes
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  21. Feb 20

    Four squares. What fraction of the total area does the yellow triangle cover?

    92 replies . 105 retweets 693 likes
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