The upper base of a trapezoid is (2/3) meters, the lower base is (4/9) meters, and the height is (1/2) meters. What is its area in square meters?
一个梯形的上底是(2/3)米，下底是(4/9)米，高是(1/2)米，它的面积是多少平方米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(2/3) + (4/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(10/9) * (1/4)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>