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The supplementary angle of $$\angle A$$ is one-third of a right angle. Find the measure of $$\angle A$$.
One-third of a right angle is $$\frac{1}{3} \times 90^\circ = 30^\circ$$, and this is the supplement of $$\angle A$$. So $$\angle A = 180^\circ - 30^\circ = 150^\circ$$.
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