parallelogram and a triangle have the same base and height. The area of the parallelogram is 9 square centimeters larger than the area of the triangle. What is the area of the triangle in square centimeters?
一个平行四边形与一个三角形等底等高，平行四边形的面积比三角形的面积大9平方厘米，三角形的面积是多少平方厘米．
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">9 / 1</gadget>
<output>9</output>

<result>9</result>