An isosceles triangle, one of its base angles is 26°, what is its apex angle in°?
一个等腰三角形，它的一个底角是26°，它的顶角是多少°．
<gadget id="calculator">26 * 2</gadget>
<output>52</output>

<gadget id="calculator">180 - 52</gadget>
<output>128</output>

<result>128</result>