The apex angle of an isosceles triangle is 96°, find one of its base angles.
一个等腰三角形的顶角是96°，求他的一个底角．
<gadget id="calculator">180 - 96</gadget>
<output>84</output>

<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<result>42</result>