Please help with question 4a-b with explanation please

1 = MR 1 = - M(R, + R2 ) 4. Figure 3 shows thin-walled cylinder and annular cylinder. 2 (a) Calculate Iring (theory) using the measured data R of ring radius in Table 1 to show that the two R2 formulas 1 = MR' and I = - M(R2 + R2) give RI 2 essentially the same value of Iring (theory) for the Thin-walled hollow cylinder Annular cylinder ring used in Exp 8.2 (error is within 3%). (b) Show that for a very thin-walled hollow cylinder Figure 3 Thin-walled and annular cylinders the formula I = - M(R2 + R2 ) becomes I = MR . 2