The three sides of a right triangle are (1/4) meter, (1/5) meter, (3/20) meter, what is the area of this right triangle.
一直角三角形的三条边分别是(1/4)米，(1/5)米，(3/20)米，这个直角三角形的面积是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) / 2</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">(1/5) * (3/40)</gadget>
<output>3/200 = around 0.015</output>

<result>3/200 = around 0.015</result>