A triangle and a parallelogram have the same area and the same base, and the height of the parallelogram is 7.5 cm. What is the height of the triangle?
一个三角形和一个平行四边形的面积相等，底也相等，平行四边形的高是7.5厘米，那么三角形的高是多少．
<gadget id="calculator">7.5 * 2</gadget>
<output>15</output>

<result>15</result>