What is the area of a triangle whose base is 6 cm, height is 10 cm and its base is equal to the height of a parallelogram.
一个平行四边形的底是6厘米，高是10厘米和它等底等高的三角形的面积是多少．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>