Respuesta :

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Answer:

[tex]b=56[/tex]

Step-by-step explanation:

Angles in a straight line add up to 180°.

[tex]180-99[/tex]

[tex]=81[/tex]

Angles in a triangle add up to 180°.

[tex]180-81-43=b[/tex]

[tex]56=b[/tex]

Answer:

b=56

Step-by-step explanation:

first angle is 43

second angle is 180-99=81

the sum of angles of triangle= 180

b+43+81=180

b=180-124=56