The base of a triangle is 40cm, and the height is 1/4 of the base. What is the area of the triangle in cm**2.
一个三角形的底是40cm，高是底的(1/4)，这个三角形的面积是多少cm**2．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 2</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">40 * 40 * (1/8)</gadget>
<output>200</output>

<result>200</result>