The perimeter of an isosceles triangle is 28 cm, the base length is 12 cm, what is the length of one side?
一个等腰三角形的周长是28厘米，底边长为12厘米，一条腰长是多少．
<gadget id="calculator">28 - 12</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>