与三角形三边都相切的圆叫做三角形的内切圆，圆心叫做三角形的内心，三角形叫做圆的外切三角形，三角形的内心是三角形三条角平分线的交点。
在蜡台上设有特殊的成型片弹簧。弹簧夹口呈三角形状，蜡烛被固定在三角形内切圆位置上。
Its specially-shaped leaf spring constitutes a triangle with the candle being fixed in the position of inscribed circle of the triangle.
提出了一种求解等边三角形及其内切圆的图像圆环点坐标新方法。
A new method for solving the coordinates of circular points in an image of an equilateral triangle and its inscribed circle was proposed.
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