This is part of our Secondary Curriculum collection of favourite rich tasks arranged by topic.
Scroll down to see the complete collection, or explore our subcollections on Perimeter and Area in two dimensions, and Surface Area and Volume in three dimensions.
problem
Favourite
Constructing triangles
Age
11 to 14
Challenge level
Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?
problem
Favourite
The farmers' field boundary
Age
11 to 14
Challenge level
The farmers want to redraw their field boundary but keep the area the same. Can you advise them?
Image
You may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.