In a triangle, the largest angle is twice the sum of the other two angles, what is the largest angle in this triangle?
在一个三角形中，最大的角等于另外两角之和的2倍，这个三角形中最大角是多少度？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

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

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

<result>120</result>