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The supplementary angle of complementary angle of three times of $$20^\circ$$ is
Three times $$20^\circ$$ is $$60^\circ$$. Its complement is $$90^\circ - 60^\circ = 30^\circ$$. The supplement of $$30^\circ$$ is $$180^\circ - 30^\circ = 150^\circ$$.
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