The Babylonians knew the relation between the length of the diagonal of a square and its side: d=square root of 2," ...

Substitute the values of a, b and c into Pythagoras’ theorem to give 2² + 4² = \(c\)². 4 + 16 = 20 To find the value of \(c\), calculate the square root of 20 This gives the final answer of ...

Forty-five, the number’s square root, is also a triangular number ... rather than noticing the theorem itself. His eponymous result is a step back, and technically says this: ...