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CBSE Class 11-science Answered

This is the derivation of moment of inertia of a solid cylinder about an axis through it's center and perpendicular to it's axis.  I understand the complete derivation but the line 
Moment of inertia of elementary disk about diameter AB = 1/4 × mass × radius² 
I don't understand why we have divided the mass by 1/4  please explain thoroughly. Step by step.
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