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How to write a math paper at the beginning of junior high school?
Books, screens, glasses, boxes ... Siheyuan is everywhere in life.

Rectangular, square, diamond, trapezoidal ... all kinds of quadrangles.

Convex quadrilateral, concave quadrilateral ... all kinds of strange things.

How interesting the quadrilateral world is! Let me show you the magical world of quadrilateral!

How about this beginning?