A parallelogram is 4.5 square centimeters larger than a triangle with the same base and height. What is the area of the triangle in square centimeters?
一个平行四边形比与它等底等高的三角形面积大4.5平方厘米，三角形的面积是多少平方厘米．
<gadget id="calculator">4.5 * 2</gadget>
<output>9</output>

<gadget id="calculator">9 - 4.5</gadget>
<output>4.5</output>

<result>4.5</result>