The base of a triangle is 3 cm, the ratio of the height to the base is 7:9, what is the height in cm?
一个三角形的底是3厘米，高与底的比是7：9，高是多少厘米．
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">3 * (7/9)</gadget>
<output>7/3 = around 2.333333</output>

<result>7/3 = around 2.333333</result>