The perimeter and area of triangles, quadrilaterals (rectangle, parallelogram ... Pythagoras Pythagoras' Theorem can be used to calculate the length of the third side of a right angled triangle ...

An understanding of how to use Pythagoras’ theorem ... square root of 52. This gives the final answer of 𝒄 = 7.211... When rounded to 1 decimal place, the length of the diagonal EG is 7.2 ...