If a triangle with a base of 6 cm and a height of 5 cm is enlarged by 3:1, what is the area of the new figure in square centimeters?
一个底是6厘米、高5厘米的三角形按3：1放大后，得到新图形的面积是多少平方厘米．
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">270 / 2</gadget>
<output>135</output>

<result>135</result>