Sn = n2 S12 = 122 = 144.
s1 = side 1 s2 = side 2 and H = Hypotenuses12 + s22 = H2therefore H = square-root of (s12 + s22)
If you mean 'Screw Thread' I will give examples, but first understand that the word screw is a process. It is something you can do. We often say 'Screw these pieces together'. Now some examples :- Top of a toothpaste tube with a screw on lid. top of a jar of food with a screw on lid . A screw thread inside a water tap handle. Most common of all of course is a wood screw, and a metal thread screw or bolt.. Also the screw thread on the cap of a bottle of soft drink.
A Dowel screw.
I think you mean an Archimedes screw.