A circle with a radius of 5 cm is drawn on a drawing at a ratio of 4:1, what is the area of the figure obtained in square centimeters?
一个半径是5厘米的圆，按4：1画在图纸上，得到的图形的面积是多少平方厘米．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<result>1_256</result>