In a right triangle, the ratio of the degrees of the two acute angles is 3:6, what is the degree of the smaller angle?
一个直角三角形中，两个锐角的度数比是3：6，那么较小的一个角是多少度．
<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">90 * (1/3)</gadget>
<output>30</output>

<result>30</result>