The radius of the base of a cylinder is 2dm and the height is 4.5dm, what is its surface area in square decimeters?
一个圆柱底面半径是2dm，高是4.5dm，它的表面积是多少平方分米．
<gadget id="calculator">50.24 + 56.52</gadget>
<output>106.76</output>

<result>106.76</result>