The lower base of an isosceles trapezoid is twice the upper base, the base angle is 45, and the height is 3 cm. What is the area of this trapezoid?
一个等腰梯形的下底是上底的2倍，底角是45，高是3厘米，这个梯形的面积是多少．
<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">18 * (3/2)</gadget>
<output>27</output>

<result>27</result>