The radius of the large circle is twice the diameter of the small circle. The area of the large circle is 30 square centimeters larger than the area of the small circle. What is the area of the large circle in square centimeters?
大圆的半径是小圆直径的2倍，大圆的面积比小圆的面积多30平方厘米，大圆面积是多少平方厘米．
<gadget id="calculator">15 / 16</gadget>
<output>15/16 = around 0.9375</output>

<gadget id="calculator">30 / (15/16)</gadget>
<output>32</output>

<result>32</result>