If a square white cloth is placed on a round table with a radius of 50 cm and a height of lm, the four corners of the white cloth just touch the ground. May I ask: How many square meters is the area of the square white cloth?
如果在半径是50cm、高度是lm的圆桌上盖一块正方形白布的话，白布的4个角刚好接触到地面．请问：正方形白布的面积是多少平方米？
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

<gadget id="calculator">0.5 * 2</gadget>
<output>1</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) / 2</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/2) * (3/4) * 4</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>