A pebble is thrown into calm water, and the water wave travels about 5 meters; a fallen leaf falls into the water, and the water wave travels about 1 meter. Which object produces the largest wave area? How big is it?
一粒小石子投到平静的水中，水波大约可传5米；一片落叶掉到水中，水波大约可传1米．哪一种物体产生的水波面积大？大多少？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

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

<gadget id="calculator">78.5 - 3.14</gadget>
<output>75.36</output>

<result>75.36</result>