The base of a triangle is 8.4m and the height is 4.5m. What is the area of a parallelogram with the same base and the same height in m**2.
一个三角形的底边是8.4m，高是4.5m，与它同底等高的平行四边形的面积是多少m**2．
<gadget id="calculator">4.5 / 2</gadget>
<output>2.25</output>

<gadget id="calculator">8.4 * 2.25 * 2</gadget>
<output>37.8</output>

<result>37.8</result>