Use the Pythagorean Theorem which is a^2+b^2=c^2 For example, on number 1
Step 1: Substitute 19^2+16^2=c^2 Step 2: Square the numbers 361+256=c^2 Step 3: Add 617=c^2 Step 4: Get the square root of both sides to isolate c sqrt(617)=c
let's do the first three there, tis just a matter of using the pythagorean theorem, and the others are more or less the same thing, check the picture below.
