An isosceles triangle is exactly surrounded by a 1-meter-long iron wire. It is known that the length of the base of the isosceles triangle is 2 decimeters. How long is the waist of this triangle in decimeters?
用一根长1米的铁丝刚好围成了一个等腰三角形，已知等腰三角形底边长2分米，这个三角形的腰长多少分米？
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>