What is the area of a triangle whose base is 4 decimeters and whose height is 30 centimeters?
一个三角形的底是4分米，高是30厘米，面积是多少平方分米．
<gadget id="calculator">30 / 10 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<result>6</result>