Three worksheets on the following topics:

• Triangle inequalities: deciding whether three numbers can represent the lengths of the sides of a triangle and determining the possible lengths of the third side of a triangle given the lengths of the other two sides
• Congruent Triangles: deciding whether a given pair of triangles are congruent
• Congruent right-angled triangles: deciding whether a given pair of right-angled triangles are congruent
• Detailed solutions are included.