how do calculate send moment of area.(adsbygoogle = window.adsbygoogle || []).push({});

here is the exampel. I do understand the way one calculate Ixx and Iyy and Ixy. the smaller part has thikness t and the biggest part 3t.

I get :

if you place global coordinate system on the top you will get the position of center of gravity to CG=(3a/8,-a/4).

Now I do: define variable s which is the road

Ixx=∫y²dA=∫t(s sin30)²ds=t[(S³/3)(1/4)]=ta³/12

and we do the same with the right part. and we will get 3ta³/12

Adding these two gives ta³/3. but in the solution they have

(ta³/3)*(1/2)².

I dont get where (1/2)² is comming from.

This is not homework! This is an example from a exam!

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# Second moment of area

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