The two diagonals of the quadrilateral are perpendicular to each other, and the lengths are 20 decimeters and 6 meters respectively. What is the area of this figure in square meters?
四边形的两条对角线互相垂直，长度分别是20分米，6米，这个图形的面积是多少平方米．
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<result>6</result>