Hi this is the 8th part to the question all the rest i have correctly done and its been marked and i will show all workings. I can email you pictures.

Any help much appreciated.

1.8 Use Euler theory to determine the second moment of the Area about the weakest axis in order to select the lightest wide flange section that might be used as a steel column at Rb with a factor of safety 3. Take 200MPa as .the limit elasticity and 200 GPa as the modulus of elasticity. Use the least radius gyration for your selection to determine the slenderness ratio to check that it will buckle rather than crush