Question

$hi$
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ad is the diameter of a circle of radius 6 cm and ab = BC = CD semi circles are drawn with ab and BD AS diameter as shown .find the perimeter and area of shaded region


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Answer 1

Hello mate....

AD=6*2=12 cm

thus are of semicircle made on base AD

A1=pi/2*6^2

=56.52 cm^2

sibnce AB=BC=CD

Thus we can say that

AB=AD/3

12/3

AB=4cm

thus area of semicircle dawn on base AB

A2=pi/2*4

=6.28cm^2

Similarly

Area of semicircle draw on base BD

A3=pi/2*16

25.12 cm^2

thus area of shaded region

A=A1-A3+A2

A=56.52-25.12+6.28

A=37.68 cm^2

I hope help you

Answer 2

$\huge\bold\red{Hey!}$

SOLUTION:-

AD = 6 X 2 = 12 cm

Area of semicircle made on base AD

A1=pi/2*6^2

56.2 cm^2

Since AB=BC = CD

So, area of semicircle dawn on base AB

A2=pi/2*4

6.28 cm^2

Area of semicircle draw on base BD

A3=pi/2*16

25.12 cm^2

Area of shaded region = 37.68 cm^2