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Research method of axisymmetric jigsaw puzzle
Let the side length of the small square in the puzzle be 1, then the side length of each square only needs four values: 1, V2, 2,

2V2, forming a geometric series. All angles only need three values: 45, 90, 135, forming a arithmetic progression; Moreover, if the angle greater than 180 minus 180 is excluded, the sum and difference of any two angles are assumed to be one of the three angles.

It is these characteristics that make the complicated seven figures can be put together into infinite shapes.

How many convex polygons can a jigsaw puzzle be put together? This effect was put forward by Japanese mathematicians in 1930s, and was handled by two math teachers of Zhejiang University. This paper was published in American Mathematical Monthly >:>. Their conclusion is that there are many convex bodies that can be spelled: only 13 polygons are needed. Their effect has lost the praise of the mathematical community.

How many pentagons can a jigsaw puzzle put together? This effect is handled by American scholars, and the conclusion is 18.

These convex polygons and pentagons were collected in our jigsaw puzzle computer game.