The apex angle of an isosceles triangle is 80°, what are the two base angles of this triangle?
等腰三角形的顶角是80°，这个三角形的两个底角都是多少°．
<gadget id="calculator">180 - 80</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>