In circle A, m BEC is 290°.сAWhat is the measure of ZBAC?70°O130°170°O360°

Hello!
As BEC = 290º and the full circle has 360º, we can solve it as:
[tex]\begin{gathered} \circ-BAC=BEC \\ 360\degree-BAC=290\degree \\ 360\degree-290\degree=BAC \\ 70\degree=BAC \end{gathered}[/tex]70º.