You'll be using Sketch 1 of this file which has three different types of triangles - scalene, isosceles, equilateral. Each triangle type has a different colour (pink for scalene, red for equilateral, ...

Using the combination of different types of angles, identify the triangle. An acute-angled triangle has three angles that ... All right-angled isosceles triangles will have these same angles.

to build on students' knowledge of triangle and to develop students' reasoning with properties of triangle to develop students' language related to attributes of triangles (e.g., from 'it looks like a ...