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为了使小朋友在学习简单的几何知识时对线段、角、三角形和凹边形有深刻的认识,我设计了多功能角演示器。结构:由4段各25厘米长的短尺构成,短尺之间用直径1.2厘米的细铁管铆合,相邻的两尺以细铁管为轴可以转动,B、C尺之间设一个量角器,并在C、D尺上与量角器刻度对应部位开一个窗口,通过窗口可看到量角器的刻度,每条尺的两端及正中央都设一个圆孔(图1)。
In order to make children have a deep understanding of line segments, angles, triangles and concave shapes when learning simple geometric knowledge, I designed a multi-function corner demonstrator. Structure: It is composed of four short legs of 25cm each. The short feet are riveted together with a thin iron pipe with a diameter of 1.2cm. The two adjacent feet are rotatable with a thin iron pipe as the shaft. A protractor is arranged between the B and C feet. , and in the C, D ruler and the corresponding part of the protractor scale to open a window, through the window to see the scale of the protractor, each ruler at both ends and the center is set to a round hole (Figure 1).