(1) The graphic area is square centimeters; ② The area of the graph is square centimeters; (3) the area of the graph is square centimeters, and the area of the graph is the largest.

62. A rectangular piece of iron: the area formula of a square is S = A2.

Answer: 49, the area of the graph is the smallest.

Objective: To investigate the students' mastery of the calculation method of square figure area.

Answer: 7; 6; 6; ①; ②③。

Analysis: Each square is calculated as 1 cm2, and less than one square is calculated as half a square.

Analyze, the area of this square is square centimeters, and then compare it according to the calculation results.

Purpose of investigation, length 13cm: The key is to determine that the side length of the largest square trimming is equal to the width of the rectangle, and then substitute it into the calculation according to the square area formula. The square is 7cm wide, and the largest square is cut from it.