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Plze answer question 11 in this

Probability = Area of Triange / Are of Circle
Area of Circle = (Pi r2)/2
Area of Triangle = r2/4
P = 2Pi / 1
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Required probability = area of triangle/area of semi-circle
= (pie*r^2/2)/(2r*r/2) = pie/2
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Oh, Just reverse the answer : 2/pie
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