Determine the area of the region — task. Mathematics CBSE, Class 10.

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$ABCD$ is a square of side 7.8

$cm$ .

$P$ ,

$Q$ ,

$R$ and

$S$ are the mid-points of

$AB$ ,

$BC$ ,

$CD$ and

$AD$ respectively. When the four arcs drawn intersect at

$P$ ,

$Q$ ,

$R$ and

$S$ , find the area of the unshaded region. [Use

$\pi$

$=$

$3.14$ ]

The area of the unshaded region

$=$

$cm^2$

$1$

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21. Determine the area of the region