The base of the triangle is 12 cm long and the height is half of the base. What is the area?
三角形的底长12cm，高是底的一半，面积是多少．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>