A triangle and a parallelogram have the same area and the same height, and the base of the parallelogram is 5 cm long, what is the length of the base of the triangle in cm?
一个三角形和一个平行四边形的面积相等，高也相等，平行四边形的底长5厘米，那么三角形底长多少厘米厘米．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>