You may hear students say words like ‘paralyzed’ triangle for isosceles and equilateral triangles after noticing the restrictive movements of these triangles upon dragging. Properties of symmetry: - ...

Recognising line ... isosceles triangle with angles of 90°, 45° and 45° is a right-angled triangle. This is the only combination of angles that is possible. All right-angled isosceles triangles ...