A circular flowerbed has a circumference of 25.12m. Now it is planned to expand to increase its radius by (1/4), so how many meters can its circumference be increased?
一个圆形花圃，周长是25.12m，现打算扩建，使其半径增加(1/4)，那么它的周长能增加多少米？
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">3.14 * 2 * 4 * (5/4)</gadget>
<output>31.4</output>

<gadget id="calculator">31.4 - 25.12</gadget>
<output>6.28</output>

<result>6.28</result>