If one angle of an isosceles triangle is 50 degrees, what is the largest angle that is not equal to 50 degrees?
一个等腰三角形的一个角是50度，与50度不相等的那个角最大是多少度．
<gadget id="calculator">180 - 50 - 50</gadget>
<output>80</output>

<result>80</result>