An isosceles triangle is formed with an iron wire 18 cm long. If the base is 8 cm long, what is the length of the waist in cm?
用一根长18厘米的铁丝围成一个等腰三角形，如果底边长8厘米，腰长多少厘米？
<gadget id="calculator">18 - 8</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>