There is a rectangle, the ratio of its length to width is 5:2, and its diagonal is 29 cm long, find the area of this rectangle.
有一长方形，它的长与宽的比是5：2，对角线长29厘米，求这个长方形的面积．
<gadget id="calculator">29 * 29</gadget>
<output>841</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">5 * 1 * 4</gadget>
<output>20</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">20 + 9</gadget>
<output>29</output>

<gadget id="calculator">20 / 29</gadget>
<output>20/29 = around 0.689655</output>

<gadget id="calculator">841 * (20/29)</gadget>
<output>580</output>

<gadget id="calculator">580 / 4</gadget>
<output>145</output>

<gadget id="calculator">145 * 2</gadget>
<output>290</output>

<result>290</result>