L4 times 4 times 12 angles and 2 L5 times 5 times 34 angles

L4 times 4 times 1/2 angles and (2) L5 times 5 times 3/4 angles are welded to a 1.5 in. plate as shown. Determine both the moments of inertia (I_x and I_y) and radii of gyration (r_x and r_y) for this built-up section with respect to the centroidal axis.

Solution

i need help with the experimental and percent error portion of this table for the vector additions 1-3. We used wheel with weights but no one recorded any data what could I fill in here to be close to what the experimental values and estimated percent errors for experimental could have been .