In the diagram below, is the centre of the circle. AB is a diameter of the circle. Chord CF produced meets chord EB produced at D. Chord EC is parallel to chord BF. CO and AC are produced.
(Feb/March 2012)
Let Ô = 2x
= 20
N
2x
6
f
2
3
E
B В
D
4.1
Determine, in terms of x, the size of Êi.
4.2
Prove that DF=BD.
(4)
4.3 Show that Ĉi = Ĉs.
4.4: If DF = 5 cm and OA = 6 cm, calculate area ABFD : area AAOC.
(16)​

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

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Use the graph of the sine function y=2sinθ shown below