Divide a square into several triangles in such a way that every triangle shares a boundary with exactly three other triangles.
Is it possible to cut this figure, called "camel"
a) along the grid lines;
b) not necessarily along the grid lines;
into \(3\) parts, which you can use to build a square?
(We give you several copies to facilitate drawing)
Cut a \(7\times 7\) square into \(9\) rectangles, out of which you can construct any rectangle whose sidelengths are less than \(7\). Show how to construct the rectangles.