CBSE Guess > Papers > Question Papers > Class X > 2009 > Mathematics > Mathematics
Q. 7. In Fig. 2, PA and PB are tangents drawn from a point P to the circle with centre O. If 
Ans . 120
Sol .
Q. 8. What is the angle subtended at the centreof a circle of radius 7 cm, by an arc of length 11 cm?
Ans . 90°
Sol .
Q. 9. A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will not be a whitemarble? 1
Sol. Total no. of marbles = 3 + 2 + 4 = 9
No. of non-white marbles = 3 + 4 = 7
P(not a white marble) = 
Q. 10. Determine k so that 3k – 2, 4k – 6 and k + 2 are three consecutive terms of an A.P. 1
Sol. 3k – 2, 4k – 6 and k + 2 are three consecutive
terms of an A.P.
4k – 6 – (3k – 2) = k + 2 – (4k – 6)
…[If a, b, c are in A.P. then b – a = c – b]
4k – 6 – 3k + 2 = k + 2 – 4k + 6
k – 4 = – 3k + 8 k + 3k = 8 + 4
4k = 12 
k = 3
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