Directions (Q.146-Q.150): In the figure given below, a goat is tied to a pole (at point O) which is the center of the semi-circular plot. The area of the plot is equal to its perimeter. BO is the length of the rope through which the goat is tied to the pole. Answer to the closest decimal. [Figure: a semicircle with diameter AC, centre O on AC, and B the topmost point of the arc with a dotted line from B to O]