The base of the triangle is 12 cm, the height is 9 cm, what is the area in square centimeters?
三角形的底是12厘米，高是9厘米，面积是多少平方厘米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 * 9 * (1/2)</gadget>
<output>54</output>

<result>54</result>