[O Levels] emath circle properties reasonings

hey guys, last minute question here. for emath, are we required to write down the full statement for the reasonings of circle properties?

e.g (∠s in opp. segment) to (angles in opposite segment)

e.g (∠s in a semicircle) to (angles in a semicircle)

e.g (∠ at centre = 2∠ at circumference) to (angle at centre = 2 times angle at circumference)

im really worried that they'll minus marks for it. my teacher always says to write the full reasoning without symbols and short forms but i really don't know. anyone can help?

update: i wrote all the full reasons for the circle properties questions. hopefully cambridge will accept them. but ok honestly this paper was much harder than paper 1.