Mathematics Education for Everybody

Angles in a triangle Angles of a polygon Polygons on right-angled triangles Pythagoras’ theorem

Return to Pythagorean Triples menu The first Pythagorean triple is 3-4-5. But did you know – and can you prove – that every Pythagorean triple has an element that is divisible by 3, an element that is divisible by 4, and an element that is divisible by 5?

Return to Pythagoras’ Theorem menu Forming a hypothesis Play with this right angled triangle. What is the relationship between the side lengths in right angled triangles? Note that side c is the hypotenuse (the side opposite the right angle). This only works for right angled triangles, as you can see here.