A rectangle is 30 cm long and 24 cm wide. Another right-angled trapezoid has an upper base of 8 cm, a lower base of 12 cm, and a height of 24 cm. Put them together to form a trapezoid. What is the area of the trapezoid in square centimeters?
一个长方形长30厘米，宽24厘米，另外一个直角梯形的上底是8厘米，下底是12厘米，高是24厘米，把他们拼成一个梯形，梯形的面积是多少平方厘米．
<gadget id="calculator">30 + 8 + 30 + 12</gadget>
<output>80</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">80 * 12</gadget>
<output>960</output>

<result>960</result>