The two sides of a right triangle are 9cm and 12cm respectively, and the length of the hypotenuse is 15cm. What is the area of the right triangle in cm**2.
一个直角三角形的两条直角边分别是9cm和12cm，斜边长15cm，这个直角三角形的面积是多少cm**2．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>