The base of a triangle is 10 decimeters, and the height is 6 decimeters. If both the base and the height are reduced to half, what is the area in square decimeters?
一个三角形的底是10分米，高是6分米，如果底和高都减少到原来的一半，面积应是多少平方分米．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">5 * (3/2)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>