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Catriona Shearer
Maths teacher and fan of geometric puzzles.
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Catriona Shearer 17h
Two overlapping squares. What’s the shaded area?
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Catriona Shearer May 19
Replying to @StrummingMom
👍
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Catriona Shearer May 19
Replying to @_WTProject
In my head, the “try numbers to see if they work” approach got me 75. Now I need to convince myself if it really is the only solution.
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Catriona Shearer May 19
Replying to @mathhombre
True, although then you’d need the additional condition that the squares were congruent. And the answer wouldn’t be quite as nice!
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Catriona Shearer May 18
Replying to @pragmatistic
It looks bigger than that to me -the diagram’s roughly to scale.
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Catriona Shearer May 18
The perimeter of each square is ⅓ of the perimeter of the triangle. What fraction is shaded?
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Catriona Shearer May 17
What’s the area of the square?
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Catriona Shearer May 17
Replying to @tampear @OHSMaths and 5 others
Here's a quick Desmos version
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Catriona Shearer retweeted
OHS Maths May 16
We’re having a Harry Potter themed day in aid of , founded by⁦⁩ . Tweet us your favourite Harry Potter maths puzzles and we’ll retweet them. Here’s a start, inspired by ⁦⁩ ‘s puzzles. ⁦⁩ ⁦⁩ ⁦
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Catriona Shearer May 15
Replying to @quirvid
It has numerical answers, but not full worked solutions.
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Catriona Shearer May 14
Replying to @MathsJam
Option A is recommended, because then you get to see all the wonderful solutions. B will save you time, but updated sporadically (usually monthly in time for ). C is the pricey option, which you can give to people who don’t have Twitter 😄
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Catriona Shearer May 14
Looking for puzzles? I have lots!Here are 3 ways to find them: A) scroll back through my tweets. B) I collect screenshots here: C) In actual real life book form (UK) or search in your local amazon site.
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Catriona Shearer May 14
One corner of the regular hexagon is on the midpoint of the triangle’s base. What fraction of the total area is shaded?
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Catriona Shearer May 13
Replying to @ZeroAlfil @_Kat_Agg
Answers included, but not solutions. There’s no way I could do justice to the incredible solutions people post on here. I’d highly recommend Geometry Snacks as a puzzle book with excellent solutions (it’s cheaper and better than mine!)
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Catriona Shearer May 13
Look at this lovely colourful thing! The awesome has turned my puzzles from 2018 into an actual book you can get for yourself off Amazon. If you have £9 to spare, you can now get more a lot more geometry in your life.
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Catriona Shearer retweeted
Ed Southall May 10
The Geometry Cheat Sheet. Some facts that can be derived or just used as they are to help solve geometry problems
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Catriona Shearer May 10
Replying to @mikeandallie
As ever, I’m completely in awe of your kids’ reasoning, and how well they articulate it. Thank you so much for sharing this 😊
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Catriona Shearer May 10
The triangle and rectangle have the same area. What fraction of the total is shaded?
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Catriona Shearer May 8
What fraction of this regular hexagon is shaded?
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Catriona Shearer May 6
What’s the angle?
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