Start with the version of Triangle Pose that lets you practice the shape on your back, in a fully supported position. Then you slowly escalate the challenge through the various versions of ...

For triangles that are not right-angled, the base is one of the sides and the perpendicular height may be shown either inside or outside the shape, it is not another side.

Isosceles triangles can be split into two right-angled triangles. This means Pythagoras’ theorem can be used to find the lengths of missing sides, such as the perpendicular height.