The perimeter of an isosceles triangle red scarf is 240 cm, its waist length is known to be 65 cm, how long is its base in cm?
一个等腰三角形红领巾周长是240厘米，已知它的腰长是65厘米，它的底边长多少厘米？
<gadget id="calculator">65 * 2</gadget>
<output>130</output>

<gadget id="calculator">240 - 130</gadget>
<output>110</output>

<result>110</result>