Kutukov BN 1990 Problem 4 variant 881

For a given cross section consisting of a channel and an isosceles angle, or an I-beam and an isosceles angle, or a channel and an I-beam, it is required: 1) determine the position of the center of gravity; 2) find the axial and centrifugal moments of inertia about random axes passing through the center of gravity; 3) determine the direction of the main central axes; 4) find the moments of inertia about the main central axes; 5) draw a section on a scale of 1:2
GIVEN: Channel No. 30; Corner No. 100×100×12, Scheme 1