Respuesta :

Answer:

because this is a parallelogram

=> b - 10 + b + 10 = 180

<=> 2b = 180

=> b = 90

with b = 90 => b - 10 = 80

                        b + 10 = 100

we also have:

d = b + 10 => d = 100

c = b - 10 => c = 80

Step-by-step explanation:

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