A surveyor measures a triangular field ABCABCABC. He finds that side BC=15 mBC = 15\text{ m}BC=15 m and side AB=8 mAB = 8\text{ m}AB=8 m. The angle BAC BAC\,BAC is 30∘30^\circ30∘.
Work out the size of angle BCABCABCA, labeled xxx. Give your answer to 3 significant figures.