What is the area in square meters of a triangular garden with a base of 1.5 meters and a height of 6 meters?
一个三角形花圃，底边是1.5米，高是6米，面积是多少平方米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">1.5 * 3</gadget>
<output>4.5</output>

<result>4.5</result>