If the angles of a trapezoid form an arithmetic sequence and the smallest angle measures $60^{\circ}$, what is the measure of the largest angle, in degrees?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If the angles of a trapezoid form an arithmetic sequence and the smallest angle measures $60^{\circ}$, what is the measure of the largest angle, in degrees?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
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If the angles of a trapezoid form an arithmetic sequence and the smallest angle measures $60^{\circ}$, what is the measure of the largest angle, in degrees?
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