Question

the raddi of two concentric circles are 123 centimetres and 73 CM respectively by how much does the area of a outer circle exceed the area of the of the inner circle

Answer 1

inner radius = 73cm
Area of inner circle = π×73^2

outer radius = 123cm
Area of outer circle = π×123^2

difference= π×123^2 - π×73^2 = π×(123^2 - 73^2) = π×(123+73)(123-73) = 22/7 × 196 × 50 = 30800 cm^2

outer circles exceeds inner circle in ara by 30800cm^2