Answer :

Hrishii

Answer:

40°

Step-by-step explanation:

[tex] m\angle A + m\angle B = 180\degree [/tex]

(Linear pair angles)

[tex] 140\degree + m\angle B = 180\degree [/tex]

[tex] m\angle B = 180\degree -140\degree [/tex]

[tex] m\angle B = 40\degree [/tex]

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