How many square pieces of paper with side length a can make a new square? Try to write three answers and express the area of the new square in different ways

How many square pieces of paper with side length a can make a new square? Try to write three answers and express the area of the new square in different ways

If a square piece of paper with side length a can not be cut, it can only be K & sup2; (k is a natural number) squares
A square with K sides
If you can move the scissors. Then any number of squares, can spell a new square
For example, seven pieces of paper with a side length of a, and the big square is a square with a side length of √ 7a
Divide it into seven rectangles and make the reference questions in the opposite direction