(a) In the figure below which is not drawn
to scale, EF is a chord of a circle pass-
ing through E, C and F. CD bisects
EF perpendicularly at D. If EF = 12
cm and CD = 2 cm, calculate the
length of the radius of the circle whose
segment is shown.
C
2 m
h
H
H
F
E
D
12 m
(b) If O is the centre of the completed cir-
cle, calculate the area of the sector
OEC correct to 3 significant figures.
(WAEC)
(Take л=3.142)

a In the figure below which is not drawnto scale EF is a chord of a circle passing through E C and F CD bisectsEF perpendicularly at D If EF 12cm and CD 2 cm ca class=