In an isosceles triangle, the base angle is 73.54°, what is the apex angle?
在一个等腰三角形中，底角是73.54°，顶角是多少．
<gadget id="calculator">73.54 * 2</gadget>
<output>147.08</output>

<gadget id="calculator">180 - 147.08</gadget>
<output>32.92</output>

<result>32.92</result>