The sum of the upper and lower bases of a trapezoid is 72 cm and the height is 25 cm. What is the area of the trapezoid in square centimeters?
一个梯形上下底的和是72厘米，高是25厘米，这个梯形的面积是多少平方厘米．
<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">72 * (25/2)</gadget>
<output>900</output>

<result>900</result>