The radius of the bottom of a cylindrical glass is 10 cm, and there is water in it. The height of the water is 12 cm. Put a small piece of iron into the glass, and the water rises to 15 cm. How many grams does the piece of iron weigh? (Weighs 7.8 grams per cubic centimeter of iron)
一个圆柱形玻璃杯底面半径是10厘米，里面装有水，水的高度是12厘米，把一小块铁块放进杯中，水上升到15厘米，这块铁块重多少克？(每立方厘米铁重7.8克)
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 100 * 3 * 7.8</gadget>
<output>7_347.6</output>

<result>7_347.6</result>