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一、三角板与直尺的叠放例1(2001湖南)如图1,将三角板的直角顶点放在直尺的一边上,∠1=30°,∠2=50°,则∠3的度数为()(A)80(B)50(C)30(D)20答D.点评通过把三角板、直尺结合,利用三角板的特殊角、直尺平行的特性,既考查了构建数学模型的能力,又考查了相关数学知识.
First, the triangular plate and straightedge stack Example 1 (2001 Hunan) Figure 1, the right angle vertex on the ruler on the side, ∠1 = 30 °, ∠2 = 50 °, then the degree of ∠3 (A) 80 (B) 50 (C) 30 (D) 20 A. Comment The ability to construct mathematical models has been examined by using the combination of set square and ruler, using the special angle of the set square and parallelism of the ruler , Also examined the relevant mathematical knowledge.