The lateral expansion of a cylinder is a square with a height of 9.42 cm. What is the radius of the base?
一个圆柱的侧面展开是一个正方形，高为9.42cm，底面半径是多少．
<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<result>1.5</result>