Outside an equilateral triangle wooden frame with a side length of 30cm, there is a plastic disc with a radius of 5cm. The disc starts from a point and rolls around the wooden frame, and then returns to the original place. The center of the disc rolls over. How many cm is the distance?
在一个边长为30cm的正三角形木框子外面，有一个半径为5cm的塑料圆片，圆片从一点出发紧贴着木框滚动一圈，再回到原地，圆片的圆心滚过的路程是多少cm？
<gadget id="calculator">30 + 5 + 5</gadget>
<output>40</output>

<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<result>120</result>