A mobile red flag of sanitation in the shape of an isosceles triangle, one of its base angles is 65°, what is the top angle of this mobile red flag?
一个形状为等腰三角形的卫生流动红旗，它的一个底角是65°，这面流动红旗的顶角是多少°．
<gadget id="calculator">180 - 65 - 65</gadget>
<output>50</output>

<result>50</result>