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The supplementary angle of the complementary angle of two times of one-fifth of a right angle is
One-fifth of a right angle is $$18^\circ$$, and two times this is $$36^\circ$$. Its complement is $$90^\circ - 36^\circ = 54^\circ$$. The supplement of $$54^\circ$$ is $$180^\circ - 54^\circ = 126^\circ$$.
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