The product of the upper base, lower base and height of a trapezoid is 60 square centimeters and 100 square centimeters respectively. What is the area of the trapezoid in square centimeters?
一个梯形的上底、下底与高相乘的积分别是60平方厘米和100平方厘米，这个梯形的面积是多少平方厘米．
<gadget id="calculator">100 + 60</gadget>
<output>160</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<result>80</result>