If the apex angle of an isosceles triangle is 98 degrees, what is the base angle?
一个等腰三角形的顶角是98度，那么它的一个底角是多少度．
<gadget id="calculator">180 - 98</gadget>
<output>82</output>

<gadget id="calculator">82 / 2</gadget>
<output>41</output>

<result>41</result>