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Homework Statement
A gyroscope consists of a uniform disc of mass M and diameter d attached at its centre to a light spindle of length l perpendicular to the plane of the disc.
i) Show that the moment of inertia, I, of the disc around the axis of the spindle is Md²/8.
Homework Equations
I=MR² Moment of inertia
The Attempt at a Solution
I can't understand why it becomes I=Md²/8 as R=d/2 and R²=d²/4 not d²/8
or am i missing something?