exam Maths Puzzle

A circular ground has area equal to 2464 m. Inside the ground there is a small circle whose radius is half of the radius of the outer circle. find the remaining area of the ground

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exam Other Question

there are two circles of different radii. the area of a square is 441 sqm. whose side is half the radius of the larger circle. the radius of the smaller circle is one-sixth of that of the larger circle. what is the area of the smaller circle? The perimeter of a square is equal to thrice the perimeter of a rectangle of length 4m and breadth 3m . what is the circumference of a semicircle . whose diameter is equal to the side of the square?