If the base of a triangle is 12 cm and half the height, what is its area in square centimeters?
一个三角形的底是12厘米，是高的一半，它的面积是多少平方厘米．
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>