It is known that the sum of the lengths of the three sides of an isosceles triangle is 62 cm. If the length of a waist is 22 cm, find the length of its base.
已知等腰三角形三边长度之和是62厘米，若一条腰长是22厘米，求它底边的长度．
<gadget id="calculator">22 * 2</gadget>
<output>44</output>

<gadget id="calculator">62 - 44</gadget>
<output>18</output>

<result>18</result>