Question

The formula A=3.14(R^2-r^2) , for R=45 mm and r=38mm , is ?

Answer 1

1,824.34

Solving steps:

=> A=3.14(R² -r²)

=> 3.14(45² - 38²)

=> 3.14(2025 - 1444)

=> 3.14(581)

=> 1,824.34