Learn about Pythagoras' theorem with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Two high school students have proved the Pythagorean theorem in a way that one early 20th-century mathematician thought was impossible: using trigonometry. Calcea Johnson and Ne’Kiya Jackson ...

Pythagoras’ theorem is always true for right-angled triangles. 130 is not the same as 121. As 𝒂² + 𝒃² does not equal 𝒄², the triangle cannot be a right-angled triangle.