Dad took Doudony to a grassland, and then he saw a horse tied to a post on the lawn with a rope about 3 meters long (the joint is not close enough), you know that the maximum range for a horse to eat grass is How much?
爸爸带逗逗尼来到一片草地上，这时他看到用一条大约3米长的绳子把马拴在草坪上的一根柱子上(接头处不及)，你知道马吃草的最大范围是多少吗？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>