56. Area of Crescent

Diagonal of the inscribed square is 4 units long. Find area of :

1. Inscribed square
   
2. Circumscribed circle
3. Area of a half-circle on the side of square
4. Area of the arc (of circumscribed circle) on the side of the square
5. Area of the each crescent
6. Area of the four crescents

How does the area of the four crescents compare with the area of the square? (1 point)