Given Total length = 20 m Diameter of semi circle = 7m
∴ Radius of semi circle = 72=3.5m
Length of rectangular field = 20 - (3.5+3.5) = 20 - 7 = 13 m
Breadth of the rectangular field = 7m
Area of garden = Area of rectangular field + Area of the two semi-circular ends.
∴ Area of rectangular field = l×b=13×7=91m2
Area of two semi circles = 2×12πr2=2×12×227×3.5×3.5=38.5m2
Area of garden = 91+38.5=129.5m2
Perimeter of garden = 2× length of the rectangular field + 2× length of the semi-circular arcs.
Now Perimeter of two semi cricles = 2×πr=2×227×3.5=22m
And Perimeter of garden = 22 + 13 + 13 = 48 m