The perimeter of an isosceles triangle is 20 cm, the length of the base is 8 cm, what is the length of one side in cm?
等腰三角形的周长是20厘米，底边长是8厘米，一条腰长多少厘米．
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>