The base length of a triangle is (2/3) that of a parallelogram base, the height of a triangle is (3/4) that of a parallelogram, and the area of a triangle is that of a parallelogram.
一个三角形的底长是一个平行四边形底的(2/3)，三角形的高是平行四边形的(3/4)，三角形面积是平行四边形的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>