Finding Pi

[SMcNeill]

Sure. In this case, it's the simple old a ^ 2 + b^ 2 = c ^2 formula

5 ^ 2 + 5 ^ 2 = c ^ 2
25 + 25 = c ^ 2
SQR(50) = c

7.07 = c

(OR in this case you can also remember the old ratio for 45% triangles... 1 to 1 to SQR(2). )