Get Ready

Once a boy was talking too much in the class , the teacher decided to get him out of the class ! he was asked a question! the answer was not known by him you are sitting beside him help him and keep him in ! the question was- A square P QRS length of its side equal to 3 +√ 5. Let M be the mid-point of the side RS. Also, let C1 be the in-circle of 4PMS and C2 be the circle that touches the sides P Q, QR and PM. Find the radius of the circle C2 "quickly solve or follow me!"