If the ratio of the degrees of the three interior angles of a triangle is 1:2:3, what is the degree of the smallest angle?
若一个三角形的三个内角的度数之比为1：2：3，则最小角的度数是多少度．
<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>