If the two sides of a right triangle are 8 cm and 5 cm respectively, what is the area of the right triangle in square centimeters?
一个直角三角形的两条直角边分别是8厘米和5厘米，这个直角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>