Area Moment of inertia of a circular wire

[i_m_sadiq]

Hlw.....I am a new guy here.....And I am taking a course of Applied Mechanics in my freshmen year....Here I have come across a term called Area of moment of inertia which I don't really understand that much........And I have been given to prove that
$$I_d = \frac{\pi a^4}{4}$$......I was trying everything but I am at my wit's end.......So, if some helps me it would be great.......A thanks in advance for the help....

 

[tiny-tim]

Welcome to PF!

Hi i_m_sadiq! Welcome to PF!

Area (no "of" ) moment of inertia is another name for second moment of area.

Search google or wikipedia for "second moment of area" and/or see the PF Library on moment of area