A wire 24 cm long forms an isosceles triangle. If one waist is 7 cm, what is the base in cm?
一根长24厘米的铁丝围成一个等腰三角形，如果一条腰是7厘米，底是多少厘米．
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">24 - 14</gadget>
<output>10</output>

<result>10</result>