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The figure below shows two circles ABPQ and ABSR intersecting at A and B. PBS, QART and ABU are straight lines. The line UST is a tangent to the circle ABSR at S. `angle` BPQ=`80^0`, `angle` PBU=`115^0` and `angle` BUS=`70^0`.

Find the values of the following angles, stating your reasons in each case.
(a) `angle` BAR
(b) `angle` STR
(c) `angle` BSU
(d) `angle` BRS