the answer in the book is 10/13
fig for question is the left side one
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angle AOC = 135°
area of X = (135/360)*π *r*r = (3/8)* π *r*r
total area = π *r*r
so probability = (3/8)*π *r*r / π*r*r = 3/8
area of X = (135/360)*π *r*r = (3/8)* π *r*r
total area = π *r*r
so probability = (3/8)*π *r*r / π*r*r = 3/8
garv1510:
ok
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