Question

a rectangular field is 100 m long and 75 m board in the middle of it there is a well of radius 3 m find the area of the land.​

Answer 1

Answer: 7471.73$m^{2}$

Step-by-step explanation:

Area of rectangular field = l X b

                                           = 100 X 75

                                           = $7500 m^{2}$

Are of circular well = πr2

                                 = 22/7 X $3^{2}$

                                 = 28.27$m^{2}$

Area of land = 7500-28.27

                      =7471.73$m^{2}$

Answer 2

Step-by-step explanation:

$length \: of \: field \: = 100m \\ breadth \: of \: field \: = 75m \\ area \: of \: field = 100m \times 75m \\ \: \: \: \: \: \: \: \: \: = 7500 {m}^{2}$

$radius \: of \: well = 3m \\ area \: of \: well = \pi {r}^{2} \\ = \pi9 {cm}^{2}$

$area \: of \: land \: = area \: of \: field \: - \: area \: of \: land \\ = 7500 - 9\pi \\ = 7471.7256$

taken π as 3.141592653