If the radius of a circle is 4cm, what is the area of the figure obtained after shrinking to the original (1/2) size?
一个圆的半径是4cm，缩小到原来的(1/2)后，得到的图形的面积是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * 4 * (1/2) * 4 * (1/2)</gadget>
<output>12.56</output>

<result>12.56</result>