What is the sum of the 4 angles obtained by folding a circular piece of paper in half twice?
把一张圆形的纸对折两次后，得到的4个角的和是多少度．
<gadget id="calculator">360 / 2</gadget>
<output>180</output>

<gadget id="calculator">180 / 2</gadget>
<output>90</output>

<gadget id="calculator">90 * 4</gadget>
<output>360</output>

<result>360</result>