If a square board is cut off by 15 cm from one side and 10 cm from the adjacent side, the area of the remaining rectangular board is 1725 square centimeters less than the original square board. What is the area of the original square board in square centimeters?
一块正方形的木板，如果从一边截去15厘米，相邻的一边截去10厘米，剩下的长方形木板比原来的正方形木板面积少1725平方厘米，原来正方形木板的面积是多少平方厘米．
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">1_725 + 150</gadget>
<output>1_875</output>

<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<gadget id="calculator">1_875 / 25</gadget>
<output>75</output>

<gadget id="calculator">75 * 75</gadget>
<output>5_625</output>

<result>5_625</result>