The side length of a square iron plate is 50 cm. According to the need, it should be divided into two parts with an area ratio of 3:7. What is the area of the larger piece in square centimeters?
一块正方形的铁皮板的边长是50厘米，按照需要，要把它分割成面积比为3：7的两部分．则较大一块的面积是多少平方厘米？
<gadget id="calculator">3 + 7</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">50 * 50 * (7/10)</gadget>
<output>1_750</output>

<result>1_750</result>