The sum of the two sides of a right triangle is 21 centimeters, their ratio is 3:4, the length of the third side is 15 centimeters, and how many centimeters is the height on the third side.
一个直角三角形的两直角边的和是21厘米，它们的比是3：4，第三边长是15厘米，第三边上的高为多少厘米．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">21 / 7</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">9 * 6 * (2/15)</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>