Basic circle is the circle which forms involute.
基圆是形成渐开线的一个定圆。
The color wheel or color circle is the basic tool for combining colors.
色轮，又称色圈是组合颜色最基本的工具。
Repeat basic shapes like square, triangle, circle and know their characteristics.
复习正方形，三角形，学习长方形，梯形，椭圆形，知道他们的特征。
Repeat basic shapes like square, triangle, circle and know their characteristics.
复习正方形，三角形，学习长方形，梯形，椭圆形，知道他们的特征。
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