Pythagoras' theorem introduction

What you'll learn

1. 1

   Imagine a right-angled triangle drawn on a square floor tile. The longest side is called the hypotenuse — it's always opposite the right angle.

2. 2

   Here's a right-angled triangle with squares drawn on each side. The biggest square is on the hypotenuse.

3. 3

   Which side of a right-angled triangle is the hypotenuse?

4. 4

   Let's use Pythagoras to find the missing side. The two shorter sides are 3 cm and 4 cm.

5. 5

   Drag the squares to match the sides. The big square should equal the two small squares together.

6. 6

   If the two shorter sides are 5 cm and 12 cm, what is the hypotenuse?

7. 7

   Pythagoras' theorem works for which type of triangle?