There is a piece of parallelogram land, the length of the base is 28m, and the height is the base (5/7), what is the area of the land in square meters?
有一块平行四边形土地，底边长28m，高是底的(5/7)，这块地的面积是多少平方米．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">28 * (5/7) * 28</gadget>
<output>560</output>

<result>560</result>