PQ PQ\,PQ and RS RS\,RS are parallel lines. TUV TUV\,TUV is an isosceles triangle where T T\,T and U U\,U lie on the line PQPQPQ, and V V\,V lies on the line RSRSRS. Angle PTV=125∘PTV = 125^\circPTV=125∘
Find the size of angle UVSUVSUVS.
Give a reason for each stage of your working.