Question: What is the length of the diagonal of a rectangle with vertices at (1, 1), (1, 4), (5, 4), and (5, 1)?

Options:

1. 4
2. 5
3. 6
4. 7

Correct Answer: 5

Solution:

The diagonal can be calculated using the distance formula: d = sqrt((5-1)^2 + (4-1)^2) = sqrt(16 + 9) = sqrt(25) = 5.