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Mathematics grid of senior high school entrance examination
(1) as shown in the figure below; (2) the fixed value is; (3) They are not fixed values, and they are 16 and 12 respectively.

Test analysis: (1) Carefully analyze the meaning of the question, understand the characteristics of "reflective quadrangle" in solving the problem, and make a graph;

(2) According to the characteristics of "reflective quadrilateral" in the question, the results are obtained by combining the characteristics of dot matrix graphics and Pythagorean theorem;

(3) According to the characteristics of the "reflective quadrilateral" in the question, the results are obtained by combining the characteristics of the grid graph and the area formula of the graph.

(1) as shown in the figure:

(2) In Figures 2 and 3, the perimeter of the reflecting quadrilateral EFGH of the rectangular ABCD is constant, and the constant value is:

(3) The areas of the reflecting quadrilateral EFGH of the rectangular ABCD in Figures 2 and 3 are not constant, and their areas are 16 and 12 respectively.

Comments: Drawing is an important problem in junior high school mathematics learning. The senior high school entrance examination is common, generally not difficult, and needs to be mastered skillfully.