in a triangle. The measure ratio of the three interior angles is 1:6:2, what is the measure of the largest angle in this triangle.
在一个三角形中．3个内角的度数比是1：6：2，这个三角形中最大的角的度数是多少．
<gadget id="calculator">1 + 2 + 6</gadget>
<output>9</output>

<gadget id="calculator">6 / 9</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">180 * (2/3)</gadget>
<output>120</output>

<result>120</result>