The base of the parallelogram is reduced to the original (1/10), the height remains the same, and the area is the same.
平行四边形的底缩小到原来的(1/10)，高不变，面积就多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>