A triangle has two right-angled sides of 4 cm, what is the area of the triangle in cm**2.
一个三角形，两条直角边都是4厘米，这个三角形的面积是多少厘米**2．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>