math help please?

?2021-04-07T20:36:42Z

∠a is supplementary to 54° so
          ∠a = 180° - 54°
          ∠a = 126°  ...................ANS

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?2021-04-07T17:54:44Z

The measure of angle a is 126°. 

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billrussell422021-04-07T17:26:57Z

180–54 = 126ª
straight line is 180º

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