Draw the largest triangle in a parallelogram whose base is 8 cm and height is 5 cm. What is the area of this triangle in square centimetres.
在一个底是8厘米，高是5厘米的平行四边形里画一个最大的三角形．这个三角形的面积是多少平方厘米．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">8 * (5/2)</gadget>
<output>20</output>

<result>20</result>