An acute triangle has a base of 18 cm and a height of 6 cm. If two such triangles are put together to form a parallelogram, what is the area of the parallelogram in square centimetres?
一个锐角三角形的底18厘米，高6厘米．两个这样的三角形拼成一个平行四边形，平行四边形的面积是多少平方厘米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 * 2</gadget>
<output>108</output>

<result>108</result>