A cut chimney is 0.8 meters long and the circumference of the bottom is 15.7dm. What is its surface area in square meters?
一个截烟囱长0.8米，底面周长15.7dm，它的表面积是多少平方米？
<gadget id="calculator">15.7 / 10</gadget>
<output>1.57</output>

<gadget id="calculator">1.57 * 0.8</gadget>
<output>1.256</output>

<result>1.256</result>