The base of the triangle is increased by (1/4), the height of this side is increased by (1/3), and the area is increased by how much.
三角形的底边增加了(1/4)，这条边上的高增加(1/3)，面积增加了多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/3) / (1/2)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>