The Austrian zebra forms a right triangle with a 30 cm long wire. The ratio of the lengths of the three sides of this triangle is 3:4:5, so what is the height in centimeters on the hypotenuse of this right triangle.
奥斑马用一根长30厘米的铁丝围成一个直角三角形．这个三角形的三条边的长度之比是3：4：5，那么这个直角三角形斜边上的高是多少厘米．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">30 * (1/4)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">(15/2) * 5</gadget>
<output>75/2 = around 37.5</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">30 * (5/12)</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">2 / (25/2)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(75/2) * (4/25)</gadget>
<output>6</output>

<result>6</result>