According to theorem of parallel axis, which of the following equation is correct
(Where IAB = Moment of inertia of the area about an axis AB, parallel to the centroidal axis.
IG = Moment of Inertia of the area about the centroidal axis passing through centriodG
a = Area of the section, and
h = Prependicular distance between centrodal axis and the axis passing through AB.)
1
IG = IAB × ah2
2
IAB = IG - ah2
3
IAB = IG + ah2
4
IG = IAB + ah2