For a given cross-section, consisting of channel and equal angles, or from an I-beam and the equal angles, or a channel and I-beam is required: 1) define the position of the center of gravity; 2) find the axial and centrifugal moments of inertia with respect to random axes passing through the center of gravity; 3) determine the direction of the principal central axes; 4) to find the moments of inertia about the main central axis; 5) draw a cross-section of a scale of 1:2.

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