The terms that do not directly relate to the Pythagorean theorem are:
- Scientific notation - This relates to expressing numbers in a standardized form, and is not directly connected to geometry or the Pythagorean theorem.
- Radius - This term is related to circles and does not relate directly to right triangles or the Pythagorean theorem.
The other terms - leg, hypotenuse, and right triangle - directly relate to the Pythagorean theorem, which deals with the relationship between the sides of right triangles. Volume is a separate concept related to three-dimensional space and is not directly related to the Pythagorean theorem either.
So, the terms that do not directly relate are scientific notation, radius, and volume.