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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 π=227\pi = \frac{22}{7})

Figure for CUET General Test 2025 13 May Shift 1 question 12 (Geometry)

Solution

✅ Correct Option: 2

The square ABCD has side = 14 cm with four circles of equal radius rr 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 rr:

Distance between adjacent centers = r+r=2rr + r = 2r

The centers are at the corners of the square, so the distance between adjacent centers equals the side of the square:

2r=142r = 14

r=7r = 7 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 = 14×πr2\frac{1}{4} \times \pi r^2

Total area of four quarter-circles inside the square:

Total circular area = 4×14×πr24 \times \frac{1}{4} \times \pi r^2

=πr2= \pi r^2

=227×7×7= \frac{22}{7} \times 7 \times 7

=227×49= \frac{22}{7} \times 49

=22×7= 22 \times 7

=154= 154 cm²


Area of square = 142=19614^2 = 196 cm²

Shaded Area = Area of Square - Area of Circular Portions

Shaded Area = 196−154196 - 154

=42= 42 cm²

Therefore, the area of the shaded region is 42 cm².

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