round block of wood has a radius of 4 cm. If its radius is reduced by 25%, what is the area of the block in square centimeters?
一块圆木块的半径是4厘米，如果它的半径减少25%，这块木块的面积是多少平方厘米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 * (3/4)</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<result>28.26</result>