If a circle with a radius of 5 cm is enlarged by 2:1, what is the area of the enlarged figure in square centimeters?
一个半径是5厘米的圆，按2：1放大后，放大后的图形的面积是多少平方厘米．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>