Investigating symmetry in triangles

Lines of symmetry in an equilateral triangle

Continuing our thinking on symmetry we have been investigating the lines of symmetry in triangles. Using georods to make different triangles we discovered that an equilateral triangle has three lines of symmetry. We then moved on to examine isosceles, right angled triangles and scalene triangles. We found out that the scalene triangle does not have any lines of symmetry, poor thing!

Checking our thinking

Isosceles symmetry

We know the name of these triangles. Do you?