Respuesta :

joe47755

Answer:

b=70

Step-by-step explanation:

(5-2)180=540

540-83-225-84-78=70

Vitor23

Answer:

70

Step-by-step explanation:

By adding all the angles, we get 470.

If we use the formula 180(n-2), where n is the number of sides, we get

180(5-2)

=180(3)

=540

540-470=70

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