(a(i))[1]
State the mathematical name of triangle $PQR$.
(a(ii))[3]
Work out angle $QPR$.
(b(i))[2]
Find angle $CDE$ and give a reason for your answer.
(b(ii))[2]
Find angle $DEF$ and give a reason for your answer.
(b(iii))[3]
Work out angle $EFD$. State the two other geometric properties needed to determine angle $EFD$.
(c)[2]
Calculate the arc length of $PQ$.