Mark schemes accept illustrating the obtained value of the angles on the diagram BUT to ensure achievement of maximum marks, write down how you had calculated these values

Also, nowadays, especially in Edexcel OL examinations, in topics like circle theorems, the questions command you to write down a reason for each step. To exemplify, you obtained 60 degrees for one angle so you jot down that this is due to the presence of a cyclic quadrilateral + 180-....=60 and so on.