The two sides and the hypotenuse of a right triangle are 3 cm, 4 cm and 5 cm respectively, what is the height of the hypotenuse of this triangle?
一个直角三角形的两条直角边和斜边分别为3厘米、4厘米和5厘米，这个三角形斜边上的高是多少．
<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>