Using a piece of rectangular paper with a length of 15 cm and a width of 12 cm, cut out a triangle with the largest area. What is the area of the triangle in square centimetres.
用一张长15厘米、宽12厘米的长方形纸，剪下一个面积最大的三角形．三角形的面积是多少平方厘米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>