Can the jigsaw puzzle be made into a rectangle?

yes.

If you want to make a rectangle with jigsaw puzzle, you can first put the hypotenuse of two big triangles on the left to form a square, and make a right angle of the big triangle the width of the rectangle to be assembled. Then put a small triangle on the upper right of the square, so that its two right-angled sides face up and left respectively, and you can make a rectangle. Tangram is an ancient traditional intellectual toy in China. As the name implies, it is composed of seven boards. These seven boards can be spliced into many figures (more than 16 kinds), such as triangles, parallelograms and irregular polygons.