Make a wooden cover for a water tank whose mouth diameter is 0.95 meters. The diameter of the wooden cover is 5 cm larger than the diameter of the tank mouth. What is the area of the wooden cover.
给缸口直径是0.95米的水缸做一个木盖，木盖的直径比缸口直径大5厘米．木盖的面积是多少．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">0.95 + (1/20)</gadget>
<output>1</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) ** 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.14 * (1/4)</gadget>
<output>0.785</output>

<result>0.785</result>