The three sides of a right triangle are 5 cm, 13 cm, and 12 cm respectively. What is the area of the triangle in square centimeters?
一个直角三角形的三条边分别是5厘米、13厘米、12厘米，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">12 * (5/2)</gadget>
<output>30</output>

<result>30</result>