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第十一課 本課主題:三角形及其分類實用敎具。1.土地分區挂圖(巨幅的),含有多角形形狀的。2.鉸鏈的多角形模型,四角形的與三角形的。可利用能折疊的鋼米突尺替代之:取其五節、四節、三節將首尾端聯繫之可得出邊爲靈活的多角形。3.可變動的三角形。用草杆來做:選三段等長的草杆須使每段之兩端均能插入(有摩擦作用),其餘兩段之端部內。將每段草杆於正中間屈折,再順次將一段的端部插進另一段的端部。這樣就得到一個三角形;將這個三角形的各邊加以伸縮就可以使工具有各種不同的形狀。
Lesson 11 The subject of this lesson: Triangles and their classification Practical cookware. 1. Land area wall map (giant), containing a polygonal shape. 2. Polygonal model of hinge, quadrangular and triangular. The foldable steel meter can be used to replace it: take five, four, and three sections to connect the first end and the end of the available edge to a flexible polygon. 3. Changeable triangles. Use straw rods to do: Select three equal lengths of straw rod so that both ends of each segment can be inserted (with friction), and the other two ends within the segment. Each section of the grass bar is folded in the middle, and then the end of one section is inserted into the end of the other section. This results in a triangle; stretching the sides of the triangle allows the tool to have a variety of shapes.