If the area of a triangle is 7.5 square centimeters, what is the area of a parallelogram with the same base and height?
一个三角形的面积是7.5平方厘米，和它等底等高的平行四边形的面积是多少．
<gadget id="calculator">7.5 * 2</gadget>
<output>15</output>

<result>15</result>