circular rubber pad has an outer diameter of 14 cm and an inner diameter of 10 cm. What is the area of the rubber pad in cm?
一个圆环形橡胶垫，外直径是14厘米，内直径是10厘米，这个橡胶垫的面积是多少厘米？
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 ** 2</gadget>
<output>49</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">49 - 25</gadget>
<output>24</output>

<gadget id="calculator">3.14 * 24</gadget>
<output>75.36</output>

<result>75.36</result>