If the base and height of a triangle are 4 cm and 7 cm respectively, what is its area in square centimeters?
一个三角形的底和高分别是4厘米，7厘米，它的面积是多少平方厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">4 * (7/2)</gadget>
<output>14</output>

<result>14</result>