The diameter of a circular dining table is 2 meters. If a circular turntable with a radius of 0.5 meters is placed in the center of the dining table, what is the remaining surface area of the table?
一个圆形餐桌面的直径是2米，如果在这张餐桌的中央放一个半径是0.5米的圆形转盘，剩下的桌面面积是多少？
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">0.5 ** 2</gadget>
<output>0.25</output>

<gadget id="calculator">1 - 0.25</gadget>
<output>0.75</output>

<gadget id="calculator">3.14 * 0.75</gadget>
<output>2.355</output>

<result>2.355</result>