Your observations could look something like this:

• I noticed that the measurement of the hypotenuse was greater than either of the legs.
• The sum of two of the angles added up to 90 degrees, and the other angle was also 90 degrees.
• The sum of all three angles was 180 degrees.
• For fun, I added the sum of the squares of the leg lengths. That sum was equal to the hypotenuse squared. Pythagorus was right!! (AB)^2+(BC)^2 =(CA)^2