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1.有关图案的计算 例1 在课本的阅读材料中,介绍了一个第七届国际数学教育大会的会徽.它的主体图案是由一连串如图1所示的直角三角形演化而成的.设其中的第一个直角三角形OA1A2是等腰直角三
1. Calculation of pattern 1 In the textbook reading material, the emblem of the 7th International Mathematical Education Conference was introduced. Its main pattern was evolved from a series of right-angled triangles as shown in Figure 1. The first right triangle OA1A2 is an isosceles right angle three