In an isosceles triangle, one vertex angle is 70°, and what are the other two base angles.
等腰三角形中，一个顶角是70°，另外两个底角分别是多少．
<gadget id="calculator">180 - 70</gadget>
<output>110</output>

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

<result>55</result>