The ratio of the three angles of a triangle is 4:3:2, what is the smallest angle?
三角形三个角度数的比是4：3：2，最小的角是多少．
<gadget id="calculator">4 + 3 + 2</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">180 * (2/9)</gadget>
<output>40</output>

<result>40</result>