I absolutely hate circle geometry. I normally THINK i have found out the answer, but it ALWAYS asks 'give a reason for your answer'. This really annoys me, as i never know how to phrase the answer - whether to state a rule i have used or just how i did it!

Anyway, i got a question here that i want someone to do for me as i cannot do it and find this really hard

a) Find the size of angle PQR

Give a reason for your answer

b) Find the size of angle PRQ

Give a reason for your answer

c) Find the size of angle POQ

Give a reason for your answer

Can someone please give this a shot?

Thanks