A triangle has a base of 23 decimeters and a height of 0.5 meters, what is its area?
一个三角形，底是23分米，高是0.5米，它的面积是多少？
<gadget id="calculator">0.5 * 10</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">23 * (5/2)</gadget>
<output>115/2 = around 57.5</output>

<result>115/2 = around 57.5</result>