If the radius of a circle is Tai times, then the area of the circle is () square meters. Draw the largest circle in a square with a side length of 4 decimeters, and the circle is The diameter of yuan is (), the perimeter is () decimeter, and the area is () square decimeter A round flower bed with a diameter of 8 meters covers an area of ()

If the radius of a circle is Tai times, then the area of the circle is () square meters. Draw the largest circle in a square with a side length of 4 decimeters, and the circle is The diameter of yuan is (), the perimeter is () decimeter, and the area is () square decimeter A round flower bed with a diameter of 8 meters covers an area of ()

If the radius of a circle is Tai times, then the area of the circle is () square meters
Draw the largest circle in a square with a side length of 4 decimeters. The diameter of the yuan is (4 decimeters), the perimeter is (12.56) decimeters, and the area is (12.56) square decimeters
A round flower bed with a diameter of 8 meters covers an area of (12.56) square meters