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Three points O, A and B are on the same horizontal ground. Point A is 80 metres to the north of O. Point B is located 70 metres on a bearing of #060^0#
from A. A vertical mast stands at point B. The angle of elevation of the top of the mast from o is #20^0#.
Calculate:
(a) The distance of B from O.
(b) The height of the mast in metres