In a triangle with two sides of equal length and an apex angle of 70°, what are the two base angles in degrees?
一个三角形，其中两条边长度相等，且顶角为70°，求两个底角的度数？
<gadget id="calculator">180 - 70</gadget>
<output>110</output>

<gadget id="calculator">110 / 2</gadget>
<output>55</output>

<result>55</result>