Dad bought an isosceles triangle kite for Tingting, one of its base angles is 50°, what is its top angle
爸爸给婷婷买了一个等腰三角形的风筝，它的一个底角是50°，它的顶角是多少
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">180 - 100</gadget>
<output>80</output>

<result>80</result>