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PQRS is a diameter of a circle of radius 6 cm. The lengths PQ, QR and RS are equal. Semi-circles are drawn on PQ and QS as diameters as shown in figure. Find the perimeter of the shaded region.

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PQRS is a diameter of a circle of radius 6cm. The lengths PQ,QR and RS are equal.Semi- circles are drawn on PQ and QS as diameters as shown in figure.Find the perimeter of the shaded region.

Circle inside a Circle : PQRS is a diameter of a circle of radius 6cm. The length PQ;QR and RS are equal.Semi circles are drawn on PQ and QS as diameters as shown in Figure.Find the perimeter and area of shaded Region.

Knowledge Check

  • PQRS is the diameter of a circle of radius 6 cm. The lengths PQ, QR and RS are equal. Semi-circles are drawn with PQ and QS as diameters as shown in the figure alongside. Find the ratio of the area of the shaded region to that of the unshaded region.

    A
    `1 : 2`
    B
    `25 : 121`
    C
    `5 : 18`
    D
    `5 : 13`

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