There is an isosceles triangle whose base to height ratio is 2:1. The three sides of this triangle are: 2 decimeters, 2 decimeters, and 2.84 decimeters. What is the area of this triangle in square decimeters?
有一个等腰三角形的底和高的比是2：1，这个三角形的三条边分别是：2分米，2分米，2.84分米，则这个三角形的面积是多少平方分米．
<gadget id="calculator">2.84 / 2</gadget>
<output>1.42</output>

<gadget id="calculator">1.42 / 2</gadget>
<output>0.71</output>

<gadget id="calculator">2.84 * 0.71</gadget>
<output>2.0164</output>

<result>2.0164</result>