png, 178.33 KB
png, 178.33 KB
html, 696 Bytes
html, 696 Bytes
2D Shapes, Coordinates, Area of Triangles
Key Stages: 3 ★

What isosceles triangles can you find with one vertex at (20,20) and an area of 9? Can you find them all?

This problem allows students to use their problem solving skills with Key Stage 3 content to produce unexpected outcomes. The problem

This resource has comprehensive teachers' notes and resources, linked from the problem page. This includes possible approaches and key questions, as well as possible support and extensions. requires an understanding of coordinates, isosceles triangles and the area of a triangle, as well as the different factors of 18.


The file attached is a HTML file, which, when opened, automatically redirects you to the problem on the NRICH website.
Creative Commons "Sharealike"

Review

5

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DaveGale

12 years ago
5

This is awesome! You need at least something like a projector for this to be any use, but next time I get a class in a computer room, I'm going to give this a whirl. It's brilliant the way the images of the correct triangles are 'frozen' on the grid and it auto-calculates the areas. You can adjust the target area too. Really: you should take a look at this one.

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