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Lorico [155]
3 years ago
15

Please help me! Thanks.

Mathematics
2 answers:
natali 33 [55]3 years ago
7 0

Answer:

\huge \boxed{\mathrm{129\° }}

Step-by-step explanation:

Adjacent angles in a parallelogram add up to 180 degrees.

\mathrm{m \angle A + m \angle B=180}

Solving for \mathrm{m \angle B}.

\mathrm{m \angle B=180-m \angle A}

\mathrm{m \angle B}=180-51

\mathrm{m \angle B=129}

Vedmedyk [2.9K]3 years ago
5 0

Answer:

129 is yr ANSWER........

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