Answer:
5.4 units
Step-by-step explanation:
Draw a horizontal line through the lower right vertex, 1 unit below the side measuring 5 units. Above this line we have a 5 by 1 rectangle. Below this line we have a triangle with vertical side length (3 - 1), or 2, horizontal side length 5. We need to find the length of the hypotenuse of this triangle. Use the Pythagorean Theorem for this purpose:
length = √(5² + 2²) = √29 ≈ 5.4 units
