A triangle and a parallelogram have the same area and height. If the base length of the triangle is 12cm, what is the base length of the parallelogram?
一个三角形与一个平行四边形面积相等高也相等，已知三角形底长12cm，平行四边形底长多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

<result>6</result>