Paper 50 cm long and 40 cm wide. The second volume of the seventh grade is followed by the first volume of the seventh grade with four chapters. The book consists of six chapters, ***6 1 class hour, for next semester. To organize this semester's mind map, a piece of paper 50 cm long and 40 cm wide is enough. Mind mapping, also known as mind mapping, is an effective graphic thinking tool to express divergent thinking. Simple but effective, characterized by simple and easy to remember. It is a practical thinking tool.