Round the square root of 5 to two decimal places

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?