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As we know the total angle of a triangle is 180 degree then if AB=2AD and P us mid point of AB then we connect the CP AND DP we can see line angle is also 180 if draw straight line from point P to line CD it makes angle withe line AB is 90 and triange ange is 90,60,&30 so we apply the paithagoras teorem in other two triangle to find length of CP and DP we can easily calculate the ans
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