A square with a perimeter of 60 meters is equal to a triangle with a base of 40 meters. What is the height of the triangle?
一块周长为60米的正方形地与一块底为40米的三角形土地面积相等，这个三角形土地的高是多少米？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">2 / 40</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">15 * 15 * (1/20)</gadget>
<output>45/4 = around 11.25</output>

<result>45/4 = around 11.25</result>