Moment of Inertia of Isosceles triangle can be easily find out by using formulas with reference to x-axis and y-axis.
Moment of Inertia of Isosceles Triangle Formula
Mathematically,
[latex]I_{0}=\frac{bh^{3}}{36}[/latex]
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[latex]Iy_{0}= \frac{hb^{3}}{48}[/latex]