The base of a triangle is 3cm, the height is 5cm, what is the area of the triangle in cm**2.
一个三角形的底是3cm，高是5cm，这个三角形的面积是多少cm**2．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">3 * (5/2)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>