If the length of one diagonal of a square is 4 feet, what is the length of the square's second diagonal?
It's the same.
To find the length of the second diagonal of a square when given the length of one diagonal, we need to use the properties of a square.
A square is a four-sided polygon with equal sides and right angles. In a square, the diagonals are perpendicular to each other and bisect each other.
Since a square has equal sides, the two diagonals are congruent, meaning they have the same length. Therefore, if the length of one diagonal is 4 feet, the length of the second diagonal will also be 4 feet.
Hence, the length of the square's second diagonal is 4 feet.