Question

1. In a rectangular field of length 100m and breadth 80m, a square pond of length 20m is made. Find the area of the remaining portion of the field.

2. A circular grass field of radius 7cm is made in a rectangular garden of length 30cm and breadth 20cm. Find the area of the remaining portion of the garden.

Answer 1

Answer:

basically use the formula

=2(100×20)

Answer 2

Answer:

1. 7600m^2.

2. 446cm^2.

Step-by-step explanation:

1. Area of rectangular field = Length × Breadth = 100m × 80m = 8000m^2

Area of square pond = Length^2 = 20m × 20m = 400m^2

Area of remaining portion of field = 8000m^2 - 400m^2 = 7600m^2.

2. Area of rectangular garden = 20cm × 30cm = 600cm^2.

Area of circular grass field = πr^2 = 22/7 × 7^2 = 22×7cm^2 = 154cm^2.

Area of remaining portion = 600cm^2 - 154cm^2 = 446cm^2.