If the base of a triangle is 16 decimeters and the height is 30 decimeters, what is the area in square decimeters?
一个三角形的底是16分米，高是30分米，面积是多少平方分米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">16 * 15</gadget>
<output>240</output>

<result>240</result>