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radius of a circle is 5cm , if we draw a rectangle of maximum size, what is the area of rectangle

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man walks at speed of 8 km/h 300 mtrs length train crosses man in 30 sec from back, find speed of train in a chess board 2 squares are cut out leaving 61 squares if we place blocks
each of length=lengthof 2 squares and width=width of 1 square how many blocks will be necessary