What is the moment of interia of a washer about the X axis?

Question

The Z axis is perpendicular to the washer plane, so when looking head on at the washer the X axis is left and right.

Answer 1

A washer is a concentric cylinder.

Ix=(1/12)m(3(Rint^2 + Rext^2) + T^2)

Ix – moment of inertia about x axis
m = mass or the washer
Rint – internal radius
Rout – external radius
T- thickness of the washer