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In figure, a dart is thrown and lands n the interior of the circle. What is the probability that the dart will land in the shaded region?

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A dart is thrown and lands in the interior of the circle.
Probability that it will land in the shaded region = (area of shaded region)/(area of circle)
We will need to find the radius of circle.
Clearly, diagonal of the rectangle = diameter of the circle.
...
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