Answer
Each Sr atom is coordinated to 6 oxygen atoms.
Work Step by Step
Each is coordinated to 4 oxygen atoms in the depicted unit cell, and 3 in an adjacent unit cell.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.