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)​

w'x is 0.

hope it

answer: it is d

step-by-step explanation:

1/2*qr*rs

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for