Where is bent into the shape of a square then the area of the square is 81 cm square when wire is bent into a semicircular shape then the area the semicircle will be?

C.

77

Side of square:
    

Where is bent into the shape of a square then the area of the square is 81 cm square when wire is bent into a semicircular shape then the area the semicircle will be?
Perimeter of square (total length of wire) = 4a = 4 x 9 = 36 cmPerimeter of semi-circle:

                       

Where is bent into the shape of a square then the area of the square is 81 cm square when wire is bent into a semicircular shape then the area the semicircle will be?


                     
Where is bent into the shape of a square then the area of the square is 81 cm square when wire is bent into a semicircular shape then the area the semicircle will be?

   
Where is bent into the shape of a square then the area of the square is 81 cm square when wire is bent into a semicircular shape then the area the semicircle will be?
∴   Area of semi-circle:

                 

Where is bent into the shape of a square then the area of the square is 81 cm square when wire is bent into a semicircular shape then the area the semicircle will be?