A triangle and a parallelogram have the same area. It is known that the base of the parallelogram is 15 cm, the height is 6 cm, the base of the triangle is 30 cm, what is the height in cm?
一个三角形和一个平行四边形面积相等．已知平行四边形底是15厘米，高是6厘米，三角形底是30厘米，高是多少厘米？
<gadget id="calculator">2 / 30</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">15 * 6 * (1/15)</gadget>
<output>6</output>

<result>6</result>