A cylindrical steel block with a base area of 45 square decimeters and a height of 7 decimeters is melted and cast into a cone with a height of 9 decimeters. What is the volume of the cone in cubic decimeters?
把一个底面积是45平方分米，高7分米的圆柱体钢块熔铸成一个高为9分米的圆锥．圆锥的体积是多少立方分米？
<gadget id="calculator">45 * 7</gadget>
<output>315</output>

<result>315</result>