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Now use what you found
SR=PRtan35 and SR=QRtan40
PRtan35 = QRtan40
PR = QR*tan(40)/tan(35)

again, let x = QR and y = h
to go from
QR^2 + h^2 = (h/sin(40))^2
to
x^2 + y^2 = (y/sin(40))^2