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Which book is the change and invariability of perimeter?
The first volume of grade three. "Change and Invariance of Perimeter" is an extended course, which comes from the "Rectangle and Square" unit in the first volume of the third grade of Mathematics, a compulsory education textbook published by People's Education Press. The teaching goal of this section is: through learning, let students master the changing law of perimeter after removing part or parts from a rectangle.