In the below figure, find the area of the shaded region. (Use $ \pi=3.14) .
"
To do:
We have to find the area of the shaded region.
Solution:
Side of the larger square $= 14\ cm$
From the figure,
$14=3+3+r+2r+r$
$4r=14-6$
$r=\frac{8}{4}$
$r=2\ cm$
This implies,
Radius of each semi-circle $= 2\ cm$
Side of the inner square $= 4\ cm$
Area of the inner square $= 4 \times 4$
$=16\ cm^2$
Therefore,
Area of four semicircles $= 4 \times \frac{1}{2} \pi r^2$
$= 2 \times 3.14 \times 2^2$
$= 8 \times 3.14$
$= 25.12\ cm^2$
Area of the shaded region $=$ Area of the large square $-$ Area of central part
$= (14)^2-(16+ 25.12)\ cm^2$
$= 196-41.12\ cm^2$
$= 154.88\ cm^2$
The area of the shaded region is $154.88\ cm^2$.
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