The right angle side of an isosceles right triangle is 0.9 meters, what is the area in square meters?
一个等腰直角三角形的直角边是0.9米，面积是多少平方米．
<gadget id="calculator">0.9 / 2</gadget>
<output>0.45</output>

<gadget id="calculator">0.9 * 0.45</gadget>
<output>0.405</output>

<result>0.405</result>