Four circles of equal radius are drawn with centers, A, B, C and D such that ABCD is a square of side 14 cm and the circles touch externally as in the figure. The area of the shaded region bounded by the 4 circles is: (Take )

Four circles of equal radius are drawn with centers, A, B, C and D such that ABCD is a square of side 14 cm and the circles touch externally as in the figure. The area of the shaded region bounded by the 4 circles is: (Take )
Solution
The square ABCD has side = 14 cm with four circles of equal radius centered at corners A, B, C, and D. The circles touch each other externally.
When two circles touch externally, the distance between their centers equals the sum of their radii.
Since all circles have the same radius :
Distance between adjacent centers =
The centers are at the corners of the square, so the distance between adjacent centers equals the side of the square:
cm
Each circle's center is at a corner of the square, so only a quarter (90° sector) of each circle lies inside the square.
Area of one quarter-circle =
Total area of four quarter-circles inside the square:
Total circular area =
cm²
Area of square = cm²
Shaded Area = Area of Square - Area of Circular Portions
Shaded Area =
cm²
Therefore, the area of the shaded region is 42 cm².
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