A piece of iron wire with a length of 150 cm is to be made into an isosceles triangle whose base is 60 cm, what is the length of its waist in cm? (neglected at joints)
一根长150厘米的铁丝，要把它做成一个底边是60厘米的等腰三角形，它的腰长是多少厘米？(接头处忽略不计)
<gadget id="calculator">150 - 60</gadget>
<output>90</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<result>45</result>