The base of the parallelogram is 12cm, the height is 7cm, what is the area of the triangle with the same base and height in cm**2.
平行四边形的底是12cm，高是7cm，与它等底等高的三角形面积是多少cm**2．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">12 * (7/2)</gadget>
<output>42</output>

<result>42</result>