- You know what the short sides and what the hypotenuse is in a right-angled triangle.

- You can make sketches.

- You can use Pythagoras' theorem to calculate the third side in a right-angled triangle when you know two sides.

- You can give exact answers.

- You can use Pythagoras' theorem in stories and round your answer sensibly.

- You can use Pythagoras' theorem in cuboids and pyramids

(NOT §6.5, finding out if triangles are acute- or obtuse-angled)