Triangles reasoning starter

This can be used as a starter activity where students simply count how many triangles they can see.

It can also be used as a longer activity where you give each student the worksheet containing 8 blank diagrams and they can shade on how many triangles they can see. They can also name the triangles and label properties of the shapes, such as equal sides or right angles.

Finally it can be used as an investigation where you ask students to justify how they know what type of triangle it is using the properties of the shape. They can also discuss lines of symmetry and calculate the area of some of the triangles.