(a(i))[1]
State the radius of this circle.
(a(ii))[1]
Use the diagram to draw one chord of this circle.
(b(i))[2]
Plot ship C on the scale drawing.
(b(ii))[2]
Calculate the real distance between ship C and ship A.
(c(i))[1]
Demonstrate that a regular octagon has an interior angle of $135^\circ$.
(c(ii))[1]
Show that two regular octagons and a square fit together at a point with no gaps.
(d)[2]
Calculate angle $EDF$.