The two sides of a triangle are 3cm and 4cm respectively, how many centimeters of rope are needed to enclose this triangle.
一个三角形的两条边分别为3cm和4cm，围成这个三角形至少需要多少cm的绳子．
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<result>9</result>