The content of the math pocket book is written as follows: the circumference of a rectangle = (length+width, ×2, c = (a+b )× 2; The circumference of a square = side length × 4, and C=4a.

Pocket book content Primary school mathematics pocket book, as its name implies, is a book that can be put in your pocket. The standard book in your pocket has no complete and accurate definition. Generally speaking, it refers to books with less than 32 copies and no more than 65,438+00 copies.