It`s someone else`s model. You can create new model.

**Calculate own characteristic each component of section**

**Common section area**

A = = cm^{2}

**Draw initial axes and define centroidal axes location.**

**Draw each shapes centroid and define their coordinates.**

**Centroid location**

**Xc = ΣX _{i}*A_{i} / A**

**Yc = ΣY _{i}*A_{i} / A**

X_{C} = () / A = () / = cm

Y_{C} = () / A = () / = cm

**Centroid location of each component in centroidal axes**

**Centroidal moments of inertia**

I_{x} = Σ(I_{X}^{own.} + b^{2} *A) = = cm^{4}

I_{y} = Σ(I_{Y}^{own.} + a^{2} *A) = = cm^{4}

I_{xy} = Σ(I_{XY}^{own.} + a*b*A) = = cm^{4}

**Angle of rotation of principal axes**

tg2α=2*I_{xy} / (I_{y}-I_{x})=2* / (-)=

α = arctg() / 2 = °

**Principal moments of inertia - moments of inertia on principal axes.**

I_{X0} = I_{x}*cos^{2}(α) + I_{y}*sin^{2}(α) - I_{xy}*sin(2*α) =

= *cos^{2}(°) + *sin^{2}(°) - 2**sin(2*°) = cm^{4}

I_{Y0} = I_{y}*cos^{2}(α) + I_{x}*sin^{2}(α) + I_{xy}*sin(2*α) =

= *cos^{2}(°) + *sin^{2}(°) + 2**sin(2*°) = cm^{4}

**Radiuses of inertia**

i_{x}^{2} = I_{X0} / A = / = 0

i_{x} = cm

i_{y}^{2} = I_{Y0} / A = / = 0

i_{y} = cm