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  1. second option

    step-by-step explanation:

    the measures of a triangle equal 180. use that to find x.





    now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

    because angle a is 40°, the first option doesn't work.

    because angle b is 60°, the second option does work.

    when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

    when you add angle a and c, you get 120°, which is not 100.

    [tex]Triangle abc has the angle measures shown. ma= (2x) mb = (3x) mc = (4x) which statement is true abou[/tex]

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