If the sum of the two sides of an equilateral triangle is 15 cm, what is the possible length of the third side of the triangle?
一个等边三角形的两条边长之和是15厘米，这个三角形的第三条边长可能是多少厘米．
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>