If the lateral expansion of a cylinder is a square with a perimeter of 50.24 decimeters, what is the radius of the base of the cylinder in decimeters?
一个圆柱的侧面展开是一个周长为50.24分米的正方形，这个圆柱的底面半径是多少分米．
<gadget id="calculator">50.24 / 4</gadget>
<output>12.56</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<result>2</result>