1. squaring
2. four triangles and the square with side length "c"
3. big square (side length: a+b)
One of the characteristics of legal English is archaic English words.
Usually, in legal texts you would use words that aren't normally used in everyday speech, in order to show the importance and formality of that document.
The difference is that each number that comes after gets multiplied by 4
Hope I helped
The measure of BC is 19 as well
