If the two sides of a triangle are 10 cm and 20 cm respectively. How many centimeters should the length of the third side be greater than?
如果一个三角形的两条边分别是10厘米和20厘米．第三边长度应大于多少厘米．
<gadget id="calculator">20 - 10</gadget>
<output>10</output>

<result>10</result>