Post by: monkeywantsabanana on April 18, 2011, 01:52:04 pm
A square has side length of 4 metres. Inside the square is a circle of radius 1.5 metres. If a dart thrown at the square is equally likely to land at any point inside the square, then the probability that it will land outside the circle is closest to :
A 0.442
B 0.295
C 0.558
D 0.250
E 0.375
This is what i did:
Area of circle =
=
Area of the square =
Pr(hitting the circle) =
=
Pr(land outside circle) =
=
which is C
The textbook reckon it's 0.442 which is A
What have I done wrong? :O
Post by: brightsky on April 18, 2011, 01:59:42 pm
Post by: jane1234 on April 18, 2011, 02:01:29 pm
Post by: monkeywantsabanana on April 18, 2011, 02:06:31 pm
thanks guys !