Extend one side of a square by 3 cm, and then draw a straight line from the corner opposite to this side to form a right-angled trapezoid. The area of this trapezoid is 9 square centimeters larger than the area of this square. What is the area of this trapezoid? square centimeter.
把一个正方形的一条边延长3厘米，再从这条边所对的角画一条直线，就成了一个直角梯形，这个梯形的面积比这个正方形的面积多9平方厘米，这个梯形的面积是多少平方厘米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">9 * (2/3)</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">36 + 9</gadget>
<output>45</output>

<result>45</result>