Answer:
The length of the dotted line is √93.
Explanation:
Use Pythagorean Theorem to solve the hypotenuse of the top triangle.
8² + 5² = √89
√89 is now known as the measurement of the bottom line as well. We can visualize the dotted line as the hypotenuse of a triangle and solve for it using Pythagorean Theorem again.
√89² + 2² = √93