A trapezoid has an upper base of (1/2) meters, a lower base of (1/2) meters, and a height of (1/2) meters. What is its area?
一个梯形上底(1/2)米，下底(1/2)米，高(1/2)米，它的面积是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) + (1/2)</gadget>
<output>1</output>

<gadget id="calculator">(1/2) / 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 * (1/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>