About this Resource
In this exploration task, students ‘discover’ the Triangle Inequality Theorem. They do this by cutting out sides of triangles of various lengths (side lengths provided) and attempting to fit them together in to various triangles. Recording their answers on a sheet, they discover that some side lengths will form triangles, but some will not. The reverse side of the worksheet develops their thinking further, until they arrive at the Triangle Inequality Theorem.
This worksheet also contains the test for acute, obtuse and right triangles. This provides either a great extension task, or an activity to return to at a later date.
All the paper resources are provided, but students will need scissors. One pair between two would be sufficient.
This activity usually takes about 20-30 minutes. If the extension activity is also attempted, it might take a little more than 30 minutes.
Please note: this resource is for use by one teacher only. Additional teachers must purchase their own license.