can someone verify what the complement of angle of 20 deg is. and the supplement of an angle of 3pie / 5

Nothing to verify because you did not say what they are.

You want to know them?

Complement angle of 20 deg is 70 deg. ---answer.
Complementary angles are 90 degrees.

Supplement angle of 3pi/5 is
2pi -3pi/5 = (10pi -3pi)/5 = 7pi/5 ---answer.
Supplementary angles are 2pi radians.

I remember it in a very wrong and politically incorrect way. If a person weighed 90 pounds, you might complement them, and if they weighed 180 pounds, you would feed them supper.

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Todd Smith
UCF Mathematics

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-Mathematics example problems for all levels through graduate school.

thank you very much!