Answer:
1)Area of the Land  is 48 square meters
2) Area of flower bed  
is  28.26 square meter
3)Area of land excluding flower bed  
is 19.74 square meters
4)cost of planting grass in land  excluding flower bed  
is Rs 118.44 
Step-by-step explanation:
Given:
Length of the Rectangular plot = 8m
Width of the rectangular plot =  6m
Radius of the circular flower bed = 3m
1)Area of the Land  
Area of the Rectangular plot  = Area of the Land  
Area of the Land   = length x width 
Area of the Land   =  8*6
Area of the Land  = 48 square meters-----------------------------(1)
2. Area of flower bed
Area of flower bed =  4 x area of one quadrant
Area of flower bed =  area of the circle
Area of flower bed  = 
where r is the radius 
Now , substituting the values
Area of flower bed = 
Area of flower bed = 28.26 square meters-----------------------------(2)
3)Area of land excluding flower bed
Area of land excluding flower bed =  Area of the rectangular land - area of flower beds
Area of land excluding flower bed =  48 - 28.26
Area of land excluding flower bed = 19.74 square meters
4)cost of planting grass in land 
Cost of planting grass per square meter = 6
Excluding the flower bed we have  19.74 square meters. to plant grass  for this 19. 74 square meters, the cost will be
 = 
 
 = Rs 118.44