Live Problems - Stage 3 & 4

Each time you visit the NRICH site there will be some activities which are 'live'. That means we are inviting you to send us your solutions and we will publish a selection of them, along with your name and school. If you'd like to read more about what we're looking for, read this short article.

Stage 3 and 4 Toughnutslive

Stage: 3 Challenge Level: Challenge Level:1

These Stage 3 and 4 problems have not yet been solved. Can you be the first?

Isometric Areaslive

Stage: 3 Challenge Level: Challenge Level:1

We usually use squares to measure area, but what if we use triangles instead?

More Isometric Areaslive

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Isometric Areas explored areas of parallelograms in triangular units. Here we explore areas of triangles...

Of All the Areaslive

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

Can you find a general rule for finding the areas of equilateral triangles drawn on an isometric grid?

Towering Trapeziumslive

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

Can you find the areas of the trapezia in this sequence?