Grandpa used 10-meter-long mats to form a grain hoard with a round bottom, and the junction took up 0.58 meters. How big is this food store?
爷爷用10米长的席子围成一个底面是圆形的粮囤，相接处占去0.58米．这个粮囤占地面积有多大？
<gadget id="calculator">10 - 0.58</gadget>
<output>9.42</output>

<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

<result>7.065</result>