21.   In the adjoining figure, ABCD is a square of side 6cm. Find the area of the shaded region.
(Ans: 34.428 sq cm)
22.   In the adjoining figure, ABCD is a rectangle with sides 4cm and 8cm.  Taking 8cm as the diameter, two semicircles are drawn. Find the area overlapped by the two semicircles.


(Ans:19.66 sq cm)



pls explain me

Here is the answer to your question (22).
For sector PQXR, PQ = QR = 4 cm
For the sector PYRQ, PR = PQ = 4 cm
In ∆PQR, PQ = QR = PR = 4 cm
∴ ∆PQR is an equilateral triangle of side 4 cm
∴ ∠PQR = ∠QPR = ∠PRQ = 60°
Now, area of the shaded portion
= 2area (PYRXQP)
= [area (sector PQXRMP) + area (segment PYMPR)]
To solve question (21), please mail your question with figure to us at support@meritnation.com.

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sorry the diagram was not copied

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i know it is an prob in merination that we can't copy diagrams from word of paint or any other place in the comp. only can copy them from net.

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