73 inches, 55 inches, 4 inches make a right angle

No

Step-by-step explanation:

Let's plug these measurements into the Pythagorean Theorem and determine whether the resulting equation is true or not:

4^2 + 55^2 = 73^2

16 + 3025 = 5329 This is false, and so:

A triangle with side lengths 73 inches, 55 inches and 4 inches is NOT a right triangle.