Use two identical triangles to form a parallelogram. If the base of the assembled parallelogram is 15cm and the height is 6cm, what is the area of one of the triangles in cm**2.
用两个完全相同的三角形拼成一个平行四边形．如果拼成的平行四边形的底是15cm，高是6cm，那么其中一个三角形的面积是多少cm**2．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>