The area of a triangle is 8.4 square decimeters, and the base length is 4 decimeters. What is the height corresponding to the parallelogram with equal base and equal area?
一个三角形的面积是8.4平方分米，底长4分米，与它等底等积的平行四边形所对应的高是多少．
<gadget id="calculator">8.4 / 4</gadget>
<output>2.1</output>

<result>2.1</result>