The sum of the upper and lower bases of a trapezoid is 23 centimeters, the length of the two waists is 5 centimeters, and the height is 4 centimeters. What is the area of the trapezoid in square centimeters?
一个梯形上底与下底的和是23厘米，两条腰分别长5厘米，高是4厘米，这个梯形的面积是多少平方厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">23 * 2</gadget>
<output>46</output>

<result>46</result>