Question: What is the length of the diagonal of a rectangle with vertices at (0, 0), (a, 0), (a, b), and (0, b)?

Options:

1. √(a^2 + b^2)
2. a + b
3. a - b
4. ab

Correct Answer: √(a^2 + b^2)

Solution:

Diagonal length = √((a - 0)² + (b - 0)²) = √(a² + b²).