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8-73.
  1. For each diagram below, write and solve an equation for x. Homework Help ✎

    a.

    b.


The sum of the interior angles = 180°(n − 2).

x + x + 125º + 90º + 125º = sum from Step 1

Mark the angles that are vertical to the labeled angles. What do you know about the angles that you marked?

x = 3º