The apex angle of an isosceles triangle is 50 degrees, how many degrees are its two base angles?
一个等腰三角形的顶角是50度，求它的两个底角各是多少度？
<gadget id="calculator">180 - 50</gadget>
<output>130</output>

<gadget id="calculator">130 / 2</gadget>
<output>65</output>

<result>65</result>