piece of cylindrical wood has a base area of 78.5 square decimeters and a height of 20 centimeters. What is its volume?
一段圆柱形木料，底面积是78.5平方分米，高是20厘米，它的体积是多少．
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">78.5 * 2</gadget>
<output>157</output>

<result>157</result>