The base of a triangle is 10 decimeters and the height is 8.57 decimeters. What is its area in square decimeters?
一个三角形的底是10分米，高是8.57分米，它的面积是多少平方分米．
<gadget id="calculator">8.57 / 2</gadget>
<output>4.285</output>

<gadget id="calculator">10 * 4.285</gadget>
<output>42.85</output>

<result>42.85</result>