The base of the triangle is 1.8 meters long and the height is 7 decimeters, what is its area in square decimeters
三角形底长1.8米，高7分米，它的面积是多少平方分米
<gadget id="calculator">7 / 10 / 2</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1.8 * (7/20) * 100</gadget>
<output>63</output>

<result>63</result>