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    Circle

    fig1

    Area:

    A=π⋅d24A=\frac{\pi \cdot d^{2}}{4}

    Perimeter:

    L=π⋅dL=\pi \cdot d

    Moments of inertia:

    Ix=Iy=π⋅d464;Iρ=π⋅d432;I_{x}=I_{y}=\frac{\pi \cdot d^{4}}{64};\quad I_{\rho}=\frac{\pi \cdot d^{4}}{32};

    Moments of resistance:

    Wx=Wy=π⋅d332;Wρ=π⋅d316;W_{x}=W_{y}=\frac{\pi \cdot d^{3}}{32};\quad W_{\rho}=\frac{\pi \cdot d^{3}}{16};

    Radius of inertia:

    ix=iy=d4i_{x} = i_{y} = \frac{d}{4}