The degree ratio of the three interior angles of a triangle is 2:3:4, what is the smallest interior angle?
一个三角形的三个内角的度数比是2：3：4，最小的一个内角是多少．
<gadget id="calculator">2 + 3 + 4</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>