Question

the weight of the rose is like a show in the centre is square and on each side there is Semi circle side of the square is 21 m if its rose plant needs 6 m square of space find out the number of plant with can be planted in full figure

Answer 1

side of square =21m
radius of each semi circle = 21/2 m
total area= area of square + area of 4 semi-circle
T.A= 21 x 21 + 4 x 1/2 x 22/7 x 21/2 x 21/2 m square
      = 441+ 11 x 3 x 21
      =  441 + 693
      =  1134 square meter
total rose that can be grown= 1134/6
                                            = 189

Answer 2

Here Pi is taken as 22/7, and I've skipped some small, easy calculations.
Hope this helps!