The perimeter of a square is 15 centimeters, what is the perimeter if its sides are reduced to one-half of their original length?
一个正方形的周长是15厘米，如果它的边长缩小到原来的二分之一，则它的周长是多少．
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>