Final answer:
The diagonals of a square are the same length and intersect at a right angle, making option B the correct answer.
Step-by-step explanation:
The best answer to the question 'The diagonals of a square:' is option B. The diagonals of a square are the same length and intersect at a right angle. In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles). A square also has a couple of other defining properties related to its diagonals:
- The diagonals of a square bisect each other. This means they cut each other exactly in half.
- The diagonals of a square are perpendicular to each other; hence they form a right angle (90 degrees) where they intersect.
- The diagonals of a square are equal in length.
Therefore, option B accurately describes the relationship between the diagonals of a square: they are the same length and intersect at a right angle.