20% of a 360o circle is 72o
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A = 60 B = 20 C = 140 This can have a large number of answers.
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The angle is 160 degrees and it's supplement is 20 degrees.
Complementary angles add to 90 degrees so the complementary angle to 70 degrees has a measure of 20 deg.
90-20= 50 so50 is the complementary angle of 20