1 Answer

Queeg · Answer 1 · 2023-03-07T17:49:40+0000

Angle C and the 112 degree angle are supplementary, so angle C measures 180-112=68 degrees.

This means that by the exterior angle theorem,
$m\angle B=51^(\circ)+68^(\circ)=\boxed{119^(\circ)}$

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