Question $3$

$(25$ Marks$)$

Consider the section of a beam shown in figure $3,$

Question $3$a:

Find the centroid $($measured from point $C$ on bottom left edge$)$ and find the location of centroid $"c"$ with respect to the principal $x-$axis.

$(10$ marks$)$

Question $3$b:

Calculate the second moment of area about $x*x$ awis and the section moduli $Z_x$ for point $"$D$"($located at the bottom corner of the section$)$

$(15$ marks$)$