It can be obtained from the circumference of the circle 18.84cm, and the radius of the circle =18.84/3.14/2 = 3cm.

So, the area of the circle =3*3*3. 14=28.26cm?

Set the length to xcm.

3x=28.26

x=9.42

Therefore, the shadow area = 28.26-3 * 3.14/2 =14.13cm?

Circumference = 9.42+9.42+4+18.84/2 = 32.26cm.

Adopt it