A square has an area of 40 square meters. What is the perimeter of the square?

Because all the sides of a square are equal, its side length is the square root of 40, which can be simplified to 2 radical 10. Then you multiply by 4 to find the perimeter, which would be 8 radical 10.

Rounding decimals is very similar to rounding other numbers. if the hundredths and thousandths places of a decimal is forty-nine or less, they are dropped and the tenths place does not change. for example, rounding 0.843 to the nearest tenth would give 0.8. , your welcome !