The ratio of the three interior angles of a triangle is 1:2:3, what is the smallest angle in this triangle?
三角形三个内角的比是1：2：3，这个三角形中最小的角是多少度．
<gadget id="calculator">1 + 2 + 3</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">180 * (1/6)</gadget>
<output>30</output>

<result>30</result>