A right triangle, the lengths of the three sides are 3cm, 4cm, 5cm respectively, what is the height of the hypotenuse of this triangle in cm?
一个直角三角形，三条边的长度分别是3cm、4cm、5cm，这个三角形斜边的高是多少cm．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 * 2 * (2/5)</gadget>
<output>12/5 = around 2.4</output>

<result>12/5 = around 2.4</result>