In order to protect trees, it is necessary to apply white ash to the trunk of a big tree. The circumference of the trunk of a big tree is measured to be 12.56dm, and the height of the trunk covered with white ash is 15dm. How big is the area covered with white ash?
为了保护树木，需要在大树的树干上涂上白灰，量得一棵大树的树干的周长是12.56dm，树干涂白灰的高度是15dm，涂白灰的面积有多大？
<gadget id="calculator">12.56 * 15</gadget>
<output>188.4</output>

<result>188.4</result>