Triangles - Pythagoras Theorem
Pythagoras Theorem
Pythagoras gets everywhere in Maths.
The rules of the Right Angled Triangle will form the basis of a reasonable amount of work that you will do within the curriculum in terms of geometry.
a2 + b2 = c2
Length a squared + Length b squared = Length c squared
This applies only within Right Angled Triangles. You can disprove that a triangle has a right angle based on the above rule.