If the base of a parallelogram is 4.2 cm and the height is 3 cm, what is the area in square centimeters of a triangle with the same base and height?
一个平行四边形的底是4.2厘米，高是3厘米，与它等底等高的三角形的面积是多少平方厘米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4.2 * (3/2)</gadget>
<output>6.3</output>

<result>6.3</result>