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三角形三个内角的和等于180°,是揭示三角形三个内角关系的重要结论.现结合验证和运用这个结论的典型例题加深对它的理解.一、利用折叠验证结论例1或许你已经通过撕下三角形的三个角拼在一起验证了“三角形三个内角的和等于180°”这个结论.不知你是否能够仿照图1,沿虚线折叠,用折纸的方法来验证这个结论呢?
The sum of the three internal angles of the triangle is equal to 180°. It is an important conclusion that reveals the relationship between the three internal angles of the triangle. Now it is combined with the typical examples of validating and applying this conclusion to deepen its understanding. First, use the proof of folding to confirm the conclusion. Example 1 Perhaps you have already torn through The three corners of the lower triangle are put together to verify that the sum of the three inner angles of the triangle is equal to 180°. This conclusion. I wonder if you can follow the example of Figure 1, folding along the dotted line, and verify this conclusion with the origami method.