In an isosceles triangle, the sum of the base angle and the apex angle is 125°, what is the apex angle of this triangle?
一个等腰三角形，它的一个底角与顶角的和是125°，这个三角形的顶角是多少°
<gadget id="calculator">180 - 125</gadget>
<output>55</output>

<gadget id="calculator">125 - 55</gadget>
<output>70</output>

<result>70</result>