Question

can any one solve it ​

Answer 1

Answer:

Step-by-step explanation:

Side of the square will be the semicircles diameter...

so d = 21 cm ... r = 21/2 cm

Area of semicircle = 1/2 pie r ^2

As both the semicircles have same radius... so area formula = 2*1/2pier^2 = pie r ^2

Now area of semicircles = 22/7 * 21/2 * 21/2 = 346.5 cm^2

:D

Answer 2

Answer:

That's a very good  Question...

Step-by-step explanation:

Given that

Side of the square is 21 cm

So the perimeter  of square is  = 21 x 4 = 84 cm

It is shown that diameter of the semicircle is 21 cm

Radius = 21/2 = 10.5 cm

It is very important to know that those two semicircles form a circle...

So the

PERIMETER of circle is = 2  x Pi x R

                           = 22/7  x 2 x 10.5

                            =  66  cm...

It is very important to notice that  AREA OF SHADED REGION = AREA OF SQUARE - AREA OF 2 SEMICIRCLES.....

SO AREA OF SHADED REGION = 84 - 66 = 18 CM.....

So the area of shaded region is 18 cm.......

Hope it helps you my friend.....

Study Well...