Question

Please help me! Thanks.

Answer 1

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 $\mathrm{m \angle B}$.

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

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

$\mathrm{m \angle B=129}$

Answer 2

Answer:

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