The radius of the larger circle is equal to the diameter of the smaller circle. The area of the smaller circle is 10 square meters. What is the area of the larger circle in square meters?
大圆的半径与小圆的直径相等，小圆的面积是10平方米，大圆的面积是多少平方米
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>