The base of a triangle is 20 meters, and its height is 1/2 of the base. What is the area of the triangle in square meters?
一个三角形的底是20米，它的高是底的(1/2)，这个三角形的面积是多少平方米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<result>100</result>