8. APPENDIX A
MOMENTS OF AREAS
A.1 Determination of The First Moment And Centroid
of A Composite Area
1 2 3
x A A A A
Q ydA ydA ydA ydA
1 1 2 2 3 3xQ A y A y A y
x i i
i
Q A y y i i
i
Q A x
i i
i
i
i
A x
X
A
i i
i
i
i
A y
Y
A