The base of a triangle is 7.8 cm long and the specific height is 1.8 cm long. What is the area of the triangle in square centimeters?
一个三角形的底长7.8厘米，比高长1.8厘米，这个三角形的面积是多少平方厘米．
<gadget id="calculator">7.8 - 1.8</gadget>
<output>6</output>

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

<gadget id="calculator">7.8 * 3</gadget>
<output>23.4</output>

<result>23.4</result>